Verified answer

bonjour

soient a et b  2  entiers  

a - b =  90

a/b = 5/2

a = 90 + b

( 90 + b )  :   b  = 5/2

180 + 2 b = 5 b

2 b - 5 b = - 180

- 3 b =  - 180

b = 60

a  -60 = 90

a = 90 + 60

a = 150