The ratio between two numbers is 7 : 8. If each number is increased by 4, the ratio becomes 9 : 10, then find the difference between the numbers.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 2.
According to the question;
⇒ (7x + 4)/(8x + 4) = 9/10
⇒ 10(7x + 4) = 9(8x + 4)
⇒ 70x + 40 = 72x + 36
⇒ 72x - 70x = 40 - 36
⇒ 2x = 4
⇒ x = 2