Question

5A + 4B + 3C = 55
si B+C=5 ; B es el doble de A
hallar el valor de A,B y C​

Answer 1

Răspuns:

Explicație pas cu pas:

B = 2A ⇒ A = B/2

B + C = 5 ⇒ C = 5 - B

5A + 4B + 3C = 5B/2 + 4B + 3(5 - B) = 5B/2 + 4B + 15 - 3B = 7B/2 + 15

7B/2 + 15 = 55

7B/2 = 40

B = 40: 7/2 = 80/7

A = B/2 = 40/7

C = 5 - B = 5 - 80/7 = -45/7