Question

Select the number-pair in which the two numbers are related in the same way as are the two numbers of the following number-pair.

4 ∶ 12

• A. 11 ∶ 34
• B. 2 ∶ 9
• C. 3 ∶ 15
• D. 10 ∶ 90

Answer 1

Answer:

D. 10 ∶ 90

Solution:

The pattern followed here is:

The sum of both numbers in the pair is a perfect square 4 ∶ 12= 4 + 12 = 16 = 4²

Similarly,

10 ∶ 90 = 10 + 90 = 100 = 10²

Hence, option D(10 : 90) is the correct answer.

Alternate solution;

4 : 12

Logic = square of 1st number - first number = second number.

4 : 12 = 4² - 4 = 16 - 4 = 12

Similarly,

10 : 90 = 10² - 10 = 100 - 10 = 90.

Hence the answer is 10: 90.