Chapter : 1
UNIT : 1 -RATIOS
EXERCISE 1(A)
Choose the most appropriate option (a) (b) (c) or (d).
1. The inverse ratio of 11 : 15 is
(a) 15 : 11 (b)√11 : √15 (c) 121 : 225
(d) none of these
Ans. (a) 15:11
2. The ratio of two quantities is 3 : 4. If the antecedent is 15, the consequent is
(a) 16 (b) 60 (c) 22
(d) 20
Ans. (d) 20
3. The ratio of the quantities is 5 : 7. If the consequent of its inverse ratio is 5, the antecedent is
(a) 5 (b) √5 (c) 7
(d) none of these
Ans. (C) 7
4. The ratio compounded of 2 : 3, 9 : 4,
5 : 6 and 8 : 10 is
(a) 1 : 1 (b) 1 : 5 (c) 3 : 8
(d) none of these
Ans.
5. The duplicate ratio of 3 : 4 is
(a)√3 : 2 (b) 4 : 3 (c) 9 : 16
(d) none of these
Ans. (C) 9:6
6. The sub-duplicate ratio of 25 : 36 is
(a) 6 : 5 (b) 36 : 25 (c) 50 : 72
(d) 5 : 6
Ans. (D) 5:6
7. The triplicate ratio of 2 : 3 is
(a) 8 : 27 (b) 6 : 9 (c) 3 : 2
(d) none of these
Ans.(a) 8:27
8. The sub-triplicate ratio of 8 : 27 is
(a) 27 : 8 (b) 24 : 81 (c) 2 : 3
(d) none of these
Ans. (C) 2:3
9. The ratio compounded of 4 : 9 and the duplicate ratio of 3 : 4 is
(a) 1 : 4 (b) 1 : 3 (c) 3 : 1
(d) none of these
Ans.
10. The ratio compounded of 4 : 9, the duplicate ratio of 3 : 4, the triplicate ratio of 2 : 3 and 9 : 7 is
(a) 2 : 7 (b) 7 : 2 (c) 2 : 21
(d) none of these
Ans.
11. The ratio compounded of duplicate ratio of 4 : 5, triplicate ratio of 1 : 3, sub duplicate ratio of
81 : 256 and sub-triplicate ratio of
125 : 512 is
(a) 4 : 512 (b) 3 : 32 (c) 1 : 12
(d) none of these
Ans.
12. If a : b = 3 : 4, the value of (2a+3b) : (3a+4b) is
(a) 54 : 25 (b) 8 : 25 (c) 17 : 24
(d) 18 : 25
Ans.
13. Two numbers are in the ratio 2 : 3. If 4 be subtracted from each, they are in the ratio 3 : 5. The
numbers are
(a) (16, 24) (b) (4, 6) (c) (2, 3)
(d) none of these
Ans.
14. The angles of a triangle are in ratio
2 : 7 : 11. The angles are
(a) (20°,70°,90°) (b) (30°,70°,80°) (c) (18°,63°,99°) (d) none of these
Ans.
15. Division of ₹324 between X and Y is in the ratio 11 : 7. X & Y would get Rupees
(a) (204, 120) (b) (200, 124)
(c) (180, 144) (d) none of these
Ans.
16. Anand earns ₹ 80 in 7 hours and Promode ₹ 90 in 12 hours. The ratio of their earnings is
(a) 32 : 21 (b) 23 : 12 (c) 8 : 9
(d) none of these
Ans.
17. The ratio of two numbers is 7 : 10 and their difference is 105. The numbers are
(a) (200, 305) (b) (185, 290)
(c) (245, 350) (d) none of these
Ans.
18. P, Q and R are three cities. The ratio of average temperature between P and Q is 11 : 12
and that between P and R is 9 : 8. The ratio between the average temperature of Q and R is
(a) 22 : 27 (b) 27 : 22
(c) 32 : 33 (d) none of these
Ans.
19. If x : y = 3 : 4, the value of
x2y + xy2: x3+ y3 is
(a) 13 : 12 (b) 12 : 13 (c) 21 : 31
(d) none of these
Ans.
20. If p : q is the sub-duplicate ratio of
p–x2 : q–x2 then x2 is
(a) p (b) q (c) pq
P+q p+q p+q
(d) none of these
Ans.
21. If 2s : 3t is the duplicate ratio2s–p:3t–p then
(a) p2 = 6st (b) p = 6st (c) 2p = 3st (d) none of these
Ans.
22. If p : q = 2 : 3 and x : y = 4 : 5, then the value of 5px + 3qy : 10px + 4qy is
(a) 71 : 82 (b) 27 : 28 (c) 17 : 28
(d) none of these
Ans.
23. The number which when subtracted from each of the terms of the ratio
19 : 31 reducing it to 1 : 4 is
(a) 15 (b) 5 (c) 1
(d) none of these
Ans.
24. Daily earnings of two persons are in the ratio 4:5 and their daily expenses are in the ratio 7 : 9. If each saves ₹ 50 per day, their daily earnings in ₹ are
(a) (40, 50) (b) (50, 40) (c) (400, 500) (d) none of these
Ans.
25. The ratio between the speeds of two trains is 7 : 8. If the second train runs 400 kms. in 5 hours, the speed of the first train is
(a) 10 Km/hr (b) 50 Km/hr
(c) 70 Km/hr (d) none of these
Ans.
UNIT : 1 -RATIOS
EXERCISE 1(A)
Choose the most appropriate option (a) (b) (c) or (d).
1. The inverse ratio of 11 : 15 is
(a) 15 : 11 (b)√11 : √15 (c) 121 : 225
(d) none of these
Ans. (a) 15:11
2. The ratio of two quantities is 3 : 4. If the antecedent is 15, the consequent is
(a) 16 (b) 60 (c) 22
(d) 20
Ans. (d) 20
3. The ratio of the quantities is 5 : 7. If the consequent of its inverse ratio is 5, the antecedent is
(a) 5 (b) √5 (c) 7
(d) none of these
Ans. (C) 7
4. The ratio compounded of 2 : 3, 9 : 4,
5 : 6 and 8 : 10 is
(a) 1 : 1 (b) 1 : 5 (c) 3 : 8
(d) none of these
Ans.
5. The duplicate ratio of 3 : 4 is
(a)√3 : 2 (b) 4 : 3 (c) 9 : 16
(d) none of these
Ans. (C) 9:6
6. The sub-duplicate ratio of 25 : 36 is
(a) 6 : 5 (b) 36 : 25 (c) 50 : 72
(d) 5 : 6
Ans. (D) 5:6
7. The triplicate ratio of 2 : 3 is
(a) 8 : 27 (b) 6 : 9 (c) 3 : 2
(d) none of these
Ans.(a) 8:27
8. The sub-triplicate ratio of 8 : 27 is
(a) 27 : 8 (b) 24 : 81 (c) 2 : 3
(d) none of these
Ans. (C) 2:3
9. The ratio compounded of 4 : 9 and the duplicate ratio of 3 : 4 is
(a) 1 : 4 (b) 1 : 3 (c) 3 : 1
(d) none of these
Ans.
10. The ratio compounded of 4 : 9, the duplicate ratio of 3 : 4, the triplicate ratio of 2 : 3 and 9 : 7 is
(a) 2 : 7 (b) 7 : 2 (c) 2 : 21
(d) none of these
Ans.
11. The ratio compounded of duplicate ratio of 4 : 5, triplicate ratio of 1 : 3, sub duplicate ratio of
81 : 256 and sub-triplicate ratio of
125 : 512 is
(a) 4 : 512 (b) 3 : 32 (c) 1 : 12
(d) none of these
Ans.
12. If a : b = 3 : 4, the value of (2a+3b) : (3a+4b) is
(a) 54 : 25 (b) 8 : 25 (c) 17 : 24
(d) 18 : 25
Ans.
13. Two numbers are in the ratio 2 : 3. If 4 be subtracted from each, they are in the ratio 3 : 5. The
numbers are
(a) (16, 24) (b) (4, 6) (c) (2, 3)
(d) none of these
Ans.
14. The angles of a triangle are in ratio
2 : 7 : 11. The angles are
(a) (20°,70°,90°) (b) (30°,70°,80°) (c) (18°,63°,99°) (d) none of these
Ans.
15. Division of ₹324 between X and Y is in the ratio 11 : 7. X & Y would get Rupees
(a) (204, 120) (b) (200, 124)
(c) (180, 144) (d) none of these
Ans.
16. Anand earns ₹ 80 in 7 hours and Promode ₹ 90 in 12 hours. The ratio of their earnings is
(a) 32 : 21 (b) 23 : 12 (c) 8 : 9
(d) none of these
Ans.
17. The ratio of two numbers is 7 : 10 and their difference is 105. The numbers are
(a) (200, 305) (b) (185, 290)
(c) (245, 350) (d) none of these
Ans.
18. P, Q and R are three cities. The ratio of average temperature between P and Q is 11 : 12
and that between P and R is 9 : 8. The ratio between the average temperature of Q and R is
(a) 22 : 27 (b) 27 : 22
(c) 32 : 33 (d) none of these
Ans.
19. If x : y = 3 : 4, the value of
x2y + xy2: x3+ y3 is
(a) 13 : 12 (b) 12 : 13 (c) 21 : 31
(d) none of these
Ans.
20. If p : q is the sub-duplicate ratio of
p–x2 : q–x2 then x2 is
(a) p (b) q (c) pq
P+q p+q p+q
(d) none of these
Ans.
21. If 2s : 3t is the duplicate ratio2s–p:3t–p then
(a) p2 = 6st (b) p = 6st (c) 2p = 3st (d) none of these
Ans.
22. If p : q = 2 : 3 and x : y = 4 : 5, then the value of 5px + 3qy : 10px + 4qy is
(a) 71 : 82 (b) 27 : 28 (c) 17 : 28
(d) none of these
Ans.
23. The number which when subtracted from each of the terms of the ratio
19 : 31 reducing it to 1 : 4 is
(a) 15 (b) 5 (c) 1
(d) none of these
Ans.
24. Daily earnings of two persons are in the ratio 4:5 and their daily expenses are in the ratio 7 : 9. If each saves ₹ 50 per day, their daily earnings in ₹ are
(a) (40, 50) (b) (50, 40) (c) (400, 500) (d) none of these
Ans.
25. The ratio between the speeds of two trains is 7 : 8. If the second train runs 400 kms. in 5 hours, the speed of the first train is
(a) 10 Km/hr (b) 50 Km/hr
(c) 70 Km/hr (d) none of these
Ans.
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