What number can you add
to 129 and subtract from 129 such that the sum of the number and 129 is
twice the difference between 129 and the number?
This problem is asking for you
to come up with the number that will satisfy the requirements. The easiest way to do this is by
coming up with an equation.
Solve/Investigate the Problem
My initial strategy was to
construct an equation based on the wording of the problem to come up with
the answer. I decided to name
the number x.
of the Problem
The equation that I came up
with was (x+129)=2(129-x). This equation is solved as
43 is our answer because the
sum of 43 and 129 is twice the difference between 129 and the 43.
43+129 = 172 129-43=86 86(2)=172
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