trevinoisella trevinoisella
  • 26-10-2014
  • Mathematics
Answered

15 is 30% of what number?



Answer :

Аноним Аноним
  • 28-10-2014
[tex]15\ is\ 30\%\ of\ x\\\\30\%=\frac{30}{100}=\frac{3}{10}=0.3\\\\15\ is\ 0.3\ of\ x\\\\therefore\\\\0.3x=15\Rightarrow x=15:0.3\\\\\boxed{x=50}\\\\other\ method:[/tex]


[tex]\begin{array}{cccc}30\%&-&15&|divide\ both\ sides\ by\ 3\\\\10\%&-&5&|multiply\ both\ sides\ by\ 10\\\\100\%&-&50&-solution\end{array}[/tex]
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