Question

Ayuda porfavor

En una frutería venden 3 Naranjas y 8 Mangos en $43.90 o 5 Naranjas y 10 Mangos en $60.50 Maria compró 7 Naranjas y 7 Mangos ¿Cuanto pago?

Answer 1

n = naranja
m = mango

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

5n + 10 * 19/5 = 60.50
5n + 38 = 60.50
5n = 60.50 - 38
5n = 22.5
n = 22.5/5
n = 4.5

m = 19/5
n = 4.5

7(4.5) + 7(19/5)
31.5 + 133/5
581/10
maria pago 58.10