Question

80 = 20
X. 28
28 = 40
7 x
15 = 6
Ｘ　 4

Answer 1

Ola Sabrina

a)

80/x = 20/28
20x = 28*80
x = 28*80/20 = 4*28 = 112

28/7 = 40/x
28x = 280
x = 280/28 = 10

15/x = 6/4
6x = 60
x = 60/6 = 10