Question

a+b+c+d=123 a<b cu 8  c=a+b  d>a cu 7  a , b,c,d=?

Answer 1

a=b-8  ⇒b=a+8
c=a+b=a+a+8=2a+8
d=a+7

a+a+8+2a+8+a+7=123
5a+23=123
5a=123-23
a=100/5
a=20
b=a+8=20+8
b=28
c=2a+8=2x20+8
c=48
d=a+7=20+7
d=27