Question

a - b = 39
a : b = 4 rest 3

Answer 1

a-b=39
a:b=4r3
a=4b+3
4b+3-b=39
3b+3=39
3b=36
b=36:3
b=12
a=4x12+3
a=48+3
a=51

Answer 2

a:b= 4 rest 3, deci rezulta a= 4b+3
si se inlocuieste in prima: 4b+3-b= 39
3b+3= 39
3b=39-3
3b=36
b=36:3
b=12
si se inlocuieste : a= 4x12+3
a=51