Question

Fie proportia a/b = 7/3
a)calculati a-b/b
b) daca a+b=30 atunci calculcati a si b

Answer 1

3 a = 7 b
a = 7b/3

a) a-b /b = 7b/3 - b / b = 4b/ 3 / b = 4/3
b) a+b = 30
7b/3 + b = 30
7b/3 + 3b/3 = 30
10 b = 90
b = 9
a = 21