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inysia [295]
4 years ago
5

Le número 85 svp merci

Mathematics
1 answer:
Elden [556K]4 years ago
6 0
Well, let's see.

Let the number be x.
We need
\frac{17-x}{23-x}=5/8
Cross multiply:
8(17-x)=5(23-x)
Expand:
136-8x=115-5x
Simplify:
3x=126-115
x=21/3=7

Check:
\frac{17-7}{23-7}=\frac{10}{16}=\frac{5}{8}  ok



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4 years ago
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