answer this........
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Given, l = 3b ..............eq1
Also, (l-3)(b+5) = lb+57
or lb-3b+5l-15 = lb+57
so,
5l-3b is 72
12b is 72.........(Using eq1)
so b is 6.
and l is 18.
Hence perimeter is 2(18+6)
= 48.....
Also, (l-3)(b+5) = lb+57
or lb-3b+5l-15 = lb+57
so,
5l-3b is 72
12b is 72.........(Using eq1)
so b is 6.
and l is 18.
Hence perimeter is 2(18+6)
= 48.....
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