Percentage Practice

$x = 10\% * y =$ $\frac{1}{10}$ $y =$ $\frac{y}{10}$

$10x =$ $\frac{y}{10}$ $* 5 =$ $\frac{5y}{10}$ $=$ $\frac{y}{2}$

$2(10x) = y$

$20x = y$

$x =$ $\frac{y}{20}$ $=$ $\frac{1}{20}$ $* y$ $=$ $\frac{20}{100}$ $* y$ $= 20\% * y$

Therefore, the answer is $20\%$ .

If x is 10% of y, then 10x is 100% of y, and 10x is 20% of 5y.

$X$ is $10\%$ of $Y$ , therefore $Y$ = $10X$ . $\frac{10X}{5Y}$ = $\frac{Y}{5Y}$ = $\frac{1}{5}$ , therefore the answer is

$20\%$