Question : Which of the following is the greatest?
2 : 5, 1 : 2, 8 : 15, 3 : 5

Option 1: 8 : 15

Option 2: 3 : 5

Option 3: 1 : 2

Option 4: 2 : 5

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 : What is the HCF of 225 and 425?

Option 1: 5

Option 2: 17

Option 3: 25

Option 4: 9

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 : The average of five consecutive odd numbers is 15. What is the smallest of these five numbers?

Option 1: 11

Option 2: 13

Option 3: 15

Option 4: 9