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ycow [4]
3 years ago
5

Find two numbers whose sum is 64 and whose difference is 42

Mathematics
1 answer:
vovangra [49]3 years ago
4 0
These numbers are  "a"  and "b".  
Sum is 64,  so  a+b=64
Difference  is 42  so  a-b=42
So you've got:
+\begin{cases} a+b=64 \\ a-b=42\end{cases} \\ \overline{, \quad2a \quad \ = \ 106} \qquad /:2 \\ a=53
When a+b=64 and a=53  you've got:
53+b=64
b=11

So these numbers is 53 and 11. 

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