Question

fie a:b-c:b=5 a-c=20 determina b​

Answer 1

Răspuns:

Explicație pas cu pas:

a-c=20->a=c+20

(c+20):b-c:b=5

c:b+20:b-c:b=5

20:b=5

b=20:5

b=4

Answer 2

$a \div b - c \div b = 5 \\ a - c = 20 \\ b(a - c) = 5 \\ b \times 20 = 5 \\ b = \frac{20}{5} \\ b = 4$