Question 169605
lets call the 3 numbers a,b,and c
:
a+b+c=137.....eq 1
b=2a+4........eq 2
c=3a-5........eq 3

take b value from eq 2 and c value from eq 3 and plug them into eq 1
:
a+(2a+4)+(3a-5)=137
:
6a-1=137
:
6a=138
:
{{{highlight(a=23)}}}
{{{highlight(b=2(23)+4=50)}}}
{{{highlight(c=3(23)-5=64)}}}