A dealer wants to mix 20 kg of product A costing rupees 2.40 per kg with product B, worth rupees 3.30 per kg to produce a mixture worth rupees 2.70 per kg. How many kilograms of product B should he use?

Answer 1

add up the values of each component:

2.40*20 + 3.30x = 2.70(20+x)