Question

A sweater was on sale at %40 off the regular price. Ella saved $20 by buying the sweater on sale. What was the regular price of the sweater?

Answer 1

so she saved $20 and that was 40% of the regular price, let's say the regular price is "x".

if 20 is 40%, what is "x" or namely the 100%?

$\bf \begin{array}{ccll} amount0&\%\\ \cline{1-2} 20&40\\ x&100 \end{array}\implies \cfrac{20}{x}=\cfrac{40}{100}\implies \cfrac{20}{x}=\cfrac{2}{5}\implies 100=2x \\\\\\ \cfrac{100}{2}=x\implies 50=x$

Answer 2

Answer:This is an equation! Solutions: x=1.

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