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21-09-2018
Mathematics

contestada

If 25 percent of x is 80 what is 90 percent of x

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25-09-2018

Method 1:

[tex]\begin{array}{cccc}25\%&-&80&|:5\\5\%&-&16&|\cdot18\\90\%&-&288\end{array}\\\\Answer:\ 90\%\ of\ x\ is\ equal\ 288[/tex]

Method 2:

[tex]\begin{array}{ccc}25\%&-&80\\90\%&-&a\end{array}\ \ \ |\text{cross multiply}\\\\25a=90\cdot80\ \ \ |:25\\\\a=\dfrac{7200}{25}\\\\a=288\\\\Answer:\ 288[/tex]

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