In what ratio must coffee at ₹120 per kg be mixed with coffee at ₹180 per kg to get a mixture worth ₹160 per kg?

Explanation

1. 01

   Cheaper : dearer $= (d - m) : (m - c) = (180 - 160) : (160 - 120) = 20 : 40$.

2. 02

   In lowest terms, 1 : 2.