Question

a=b+72. (a+b):(a-b)=5 rest 2

Answer 1

a=b+72.

(a+b):(a-b)=5 rest 2
a+b=5*(a-b)+2
a+b= 5a-5b+2
b+5b=5a-a+2
6b= 4a+2
6b=2*(2a+1)
2a+1=3

a=b+72.

2*(b+72)+1=3
2b+144=3-1
2b= -144+2
2b=- 142
b= -71

a=b+72.
a= - 71+72
a=1