<em>Aaron 14 years</em>
<em>Devon 17 years</em>
<em>D = A + 3</em>
<em>D + A = 31</em>
<em>replace D</em>
<em>A + 3 + A = 31</em>
<em>2A = 31 - 3</em>
<em>2A = 28</em>
<em>A = 14 years</em>
<em>D = 17 years</em>
Answer:
51
Step-by-step explanation:
big windows 48
small windows 12
broken windnows9
unbroken windows= 48+12-9= 51
unbroken 51 windows
