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Question: $45\space is\space 18%$ of what number?

$\therefore {part \over whole} = \frac{45}{x} = \frac{18}{100}$

$18\cdot x = 45\cdot100$

$\sout{18}\cdot x = 45\cdot100\swarrow$ Divide by 18 on both sides of equation

$x = \boxed {45\cdot 100 \over 18}$

$x = \boxed { \sout{45^5}\cdot 100 \over \sout{18_2}}$ Divide by 9

$x = \boxed {5\cdot \sout {100^{50}} \over \sout 2_1}$ Divide by 2

$x=$ $5\cdot 50 \gets 250$

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