Multiple choice

The ratio of petrol and kerosine in the container is 3 : 2 when 10 litres of the mixture is taken out and is replaced by the kerosine, the ratio becomes 2 : 3. Initially, the total quantity of the mixture in the container is

  1. 25

  2. 30

  3. 45

  4. Cannot be determined

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let initial petrol be 3x and kerosene be 2x. Total = 5x. Removing 10L removes 6L petrol and 4L kerosene. Remaining: (3x-6) petrol and (2x-4+10) kerosene. Ratio (3x-6)/(2x+6) = 2/3. 9x - 18 = 4x + 12, so 5x = 30.