Posted by Alexa on Tuesday, January 24, 2012 at 7:20pm.
16 + 2s = old perimeter
16+24 + 2(s+24) = 2(16+2s)
40 + 2s + 48 = 32 + 4s
2s = 56
s = 28
so, the old perimeter was 16+2*28 = 72
the new perimeter is 40 + 2*52 = 148
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