Question 353572
Hi,
.
Question states
{{{(a+b)/2 = 18}}}
b = 36 - a
.
and
{{{(a/b) = (5/4)}}}
a = (5/4)b
.
b = 36 - (5/4)b
b + (5/4)b = 36
2(1/4) b = 36
(9/4)b = 36
b = 36*(4/9)
b  = 16  
a = (5/4)16 or 20
.
calculate
a - b