Question

en una fruteria venden 3 naranjas y 8mangos en 43.90 o 5 naranjas y 10 mangos por 60.50
maria compro 7 naranjas y 7 mangos cuanto pago??

Answer 1

3n + 8m = 43.90
5n + 10m = 60.50

n = 439/30 - 8/3m
5n + 10m = 60.50

5(439/30 - 8/3m) + 10m = 60.50
439/6 - 40/3m + 10m = 121/2
439/6 - 10/3m = 121/2
439 - 20m = 363
- 20m = 363 - 439
- 20m = -76
m = 76/20
m = 19/5
m = 3.8

5n + 10 * 19/5 = 60.50
5n + 2 * 19 = 60.50
5n + 38 = 60.50
5n = 60.50 - 38
5n = 22.50
n = 22.50/5
n = 4.5

naranjas = 4.5
mangos = 3.8

7(4.5) + 7(3.8)
31.5 + 26.6
58.1