Question
Two cans of oil cost Rs. $75$/litre and Rs. $60$/litre for oils of $80\%$ and $40\%$ concentration. When they are mixed in a certain proportion, the resulting can of oil costs Rs. $56.25$.
Find the oil concentration of the resulting mixture.
Cost of oil in first can = $75\times 80/100 = 60$
Cost of oil in second can = $60\times 40/100 = 24$
Is this correct way to proceed this question?