A grocer mixes coffee powder of 2 types, one of which is priced at Rs. 60 and the other at Rs. 90. What should be the ratio of combining the two, to sell the blended mix coffee powder of the two types at Rs. 80?
Let amount of first and second type of coffee powder are x and y respectively
60 x + 90 y = 80 (x + y)
6x + 9y = 8 (x + y)
y = 2x ⇒ x: y = 1: 2