A 30-litre mixture of oil and kerosene contains oil and kerosene in the ratio 2 : 1. Some quantity of kerosene is added, changing the ratio to 1 : 2. What is the quantity of kerosene added?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 30 L.
Total mixture = 30 L
Oil = 2/3 × 30 = 20 L
Kerosene = 1/3 × 30 = 10 L
Let x L kerosene added
20/(10 + x) = 1/2
⇒ 40 = 10 + x
⇒ x = 40 - 10 = 30 L