How many kg of tea at ₹180 per kg must be mixed with 15 kg of tea at ₹240 per kg to make a blend worth ₹200 per kg?

Explanation

1. 01

   Cheaper : dearer $= (240 - 200) : (200 - 180) = 40 : 20 = 2 : 1$.

2. 02

   So the cheaper tea is twice the dearer: $2 \times 15 = 30$ kg.