Question

a toy gun cost 10 pesos more than a doll. the total cost of 3 such toy guns and 4 such dolls was 163 pesos. find the average cost of a toy gun.

Answer 1

g = d + 10 ... d = g - 10

3 g + 4 d = 163

substituting ... 3 g + 4(g - 10) = 163 ... 3 g + 4 g - 40 = 163