Juice costs ₹90 a litre. In what ratio must water be mixed with the juice so that the mixture costs ₹75 a litre?

Explanation

1. 01

   Water is the cheaper kind, at ₹0. Water : juice $= (90 - 75) : (75 - 0) = 15 : 75$.

2. 02

   In lowest terms, 1 : 5.