Question : If p : q : r = 2 : 5 : 3 and r : s = 6 : 5, then what is the value of p : q : r : s?

Option 1: 4 : 12 : 7 : 3

Option 2: 4 : 10 : 6 : 5

Option 3: 6 : 5 : 8 : 10

Option 4: 8 : 12 : 7 : 8

Question : The lengths, the breadths, and the volumes of two cuboids are in the ratios of 4 : 5, 3 : 4, and 2 : 3, respectively. What is the ratio of their heights?

Option 1: 3 : 5

Option 2: 10 : 9

Option 3: 8 : 15

Option 4: 2 : 3

Question : The average of prime numbers between 1 and 20 is:

Option 1: $9$

Option 2: $9\frac{5}{8}$

Option 3: $10\frac{1}{8}$

Option 4: $8$

Question : Directions: By interchanging the given two numbers (not digits) which of the following equations will not be correct?
5 and 6

Option 1: 6 × 8 – 5 × 4 = 16

Option 2: 5 × 2 – 4 + 6 = 13

Option 3: 5 – 3 × 6 + 4 = –3

Option 4: 6 – 5 + 2 = 1

Question : If the ratio of the volumes of two cylinders is 6 : 5 and the ratio of their heights is 5 : 24, then what is the ratio of their radii?

Option 1: 12 : 7

Option 2: 5 : 6

Option 3: 1 : 2

Option 4: 12 : 5