A 45-litre mixture of kerosene and diesel contains kerosene and diesel in the ratio 4 : 5. How much diesel must be added to make the ratio 4 : 6?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 5 L.
Mixture = 45 L
Kerosene = (4/9) × 45 = 20 L
Diesel = (5/9) × 45 = 25 L
Let the diesel be added = x L
20/(25 + x) = 4/6 = 2/3
⇒ 60 = 50 + 2x
⇒ 2x = 10
⇒ x = 5 L