A shop has 30 litres of mustard oil at ₹150 per litre. How many litres of groundnut oil at ₹190 per litre must be mixed with it so that the blend costs ₹166 per litre?

Explanation

1. 01

   Mustard : groundnut = $(190 - 166) : (166 - 150) = 24 : 16 = 3 : 2$.

2. 02

   3 parts = 30 litres, so 1 part = 10 litres.

3. 03

   Groundnut oil = $2 \times 10 = 20$ litres.