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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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\begin{array}{|c|ll} \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{60\% of 5000}}{\left( \cfrac{60}{100} \right)5000}\implies 3000~\hfill \underset{current~value}{\stackrel{5000~~ + ~~3000}{8000}}

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