Invisagirl
Invisagirl Invisagirl
  • 13-01-2019
  • Mathematics
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12 is what percent of 40

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jdoe0001 jdoe0001
  • 13-01-2019

we know that 40 is the 100%, so what would 12 be off of it in percentage?


[tex]\bf \begin{array}{ccll} amount&\%\\ \cline{1-2} 40&100\\ 12&x \end{array}\implies \cfrac{40}{12}=\cfrac{100}{x}\implies \cfrac{10}{3}=\cfrac{100}{x} \\\\\\ 10x=300\implies x=\cfrac{300}{10}\implies x=30[/tex]

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