Question

Sylvia paid $4.20 for 2kg of sugar and 4 kg of flour. If 1 kg of sugar and 1 kg of flour cost $1.50, find the cost of 1 kg of flour.

Answer 1

cost of sugar --- $x per kg
cost of flour --- 1.5 - x per kg

2x + 4(1.5-x) = 4.2
solve for x