Question

When 30% of one number is subtracted from another number, the second number reduces to its four-fifths. What is the ratio of the first to the second number?

Options

• 2 : 5

• 2 : 3

• 4 : 7

• cannot be determined

Answer 1

2 : 3

Explanation:

Let the first and second numbers be A and B. Then B – 0.3A = 0.8B, so 0.3A = 0.2B and A : B = 2 : 3.