The total Number of hamburgers sold is 55
Let :
Number of chicken sold = x
Number of hamburgers sold = 20 + x
The total earning can be related with the equation:
1.60x + 0.95(20 + x) = 103.15
1.60x + 19 + 0.95x = 103.15
1.60x + 0.95x = 103.15 - 19
2.55x = 84.15
Divide both sides by 2.55 to isolate x
x = 84.15 / 2.55
x = 33
The number of hamburgers sold = (20 + x) = 20 + 33 = 53
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