91
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ninety 87 + 91 = 178 95 + 92 + 85 = 272 178 + 272 = 450 there are five numbers so divide total by 5 450/5 = 90
You need to resubmit this so it is an equation. Could you mean 2m=m-87? If so, then follow this. subtract an m from each side: 2m-m = m-87-m simplify: m = -87 Now plug that number back in to check: 2(-87) = (-87) minus 87 -174 = -174 so it checks.
Half perimeter = 109. Subtract 87 and half the answer 22/2 = 11, this is the width. Add on the 87 giving 98, this is the length.
30% of 178= 30% * 178= 0.3 * 178= 53.4
They are: 2*89 = 178 and 1*178 = 178