# Ratio and Proportion

Q51. If the income of A is 10% more than that of B and the income of B is 10% less than that of C, then the incomes of A, B, C are in the ratio
(a) 79:80:100
(b) 89:80:100
(c) 89:90:100
(d) 99:90:100

Q52. The average age of 3 girls is 20 years and their ages are in the proportion 3:5:7. The age of youngest girl is
(a) 12
(b) 13
(c) 14
(d) 15

Q53. The ratio of the number of students studying in school A, B, C is 5:6:8. If the number of students in each of the schools is decreased by 5%, 10% and 15% respectively. What will be the new ratio of the students in school A, B and C ?
(a) 88:108:112
(b) 92:108:126
(c) 95:108:136
(d) 98:108:148

Q54. Two numbers are in the ratio 5:7. If each number is decreased by 5, the ratio becomes 3:5. The numbers are
(a) 13/2, 23/2
(b) 21/2, 33/2
(c) 25/2, 35/2
(d) 35/2, 41/2

Q55. If 1/5 : 1/x :: 1/x : 1/1.25, then 1/x = ?
(a) 1/2.5
(b) 1/2.7
(c) 1/3
(d) 1/3.5

Q56. A square and a circle have the same area. The ratio of the side of the square and the radius of the circle is
(a) √π : 1
(b) π : 1
(c) 1 : π
(d) 1 : √π

Q57. If P is proportional to Q and P = 6. When Q = 3 then what is the value of P when Q = 12 ?
(a) 14
(b) 16
(c) 20
(d) 24

Q58. The ratio between the ages of Sita and Gita is 5:6 and the sum of there ages is 33 years. The ratio of their ages after 5 years will be ?
(a) 17 : 21
(b) 18 : 21
(c) 20 : 23
(d) 23 : 27

Q59. Third proportional of 0.12 and 0.36 is
(a) 1.08
(b) 1.21
(c) 1.26
(d) 1.57

Q60. Third proportional of 0.12 and 0.36 is
(a) 1.08
(b) 1.21
(c) 1.26
(d) 1.57