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A + B = 72 A - B = 38 A ÷ B = ?

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Jers15viz
A+B=72
A-B=38
A/B=?

First, find the value of A
A-B=38
A=B+38

Substitute the value of A to the first equation.
A+B=72
B+38+B=72
2B+38=72
2B=34
B=17

A=B+38
A=17+38
A=55
Substitute the value to the 3rd equation.
A/B
55/17
=3 4/17

Hope this helps =)