Question

Destiny answered 75 percent of the questions on a quiz correctly if she answered 15 questions correctly how many questions are on the quiz? Grade 6 unit 3 reveiw

Answer 1

well, the quiz really has "x" questions, which oddly enough is the 100%.

we also know that Destiny answered 15, and that's 75%, what the dickens is "x"?

`\begin{array}{ccll} amount&\%\\ \cline{1-2} x & 100\\ 15& 75 \end{array} \implies \cfrac{x}{15}~~=~~\cfrac{100}{75} \\\\\\ \cfrac{ x }{ 15 } ~~=~~ \cfrac{ 4 }{ 3 }\implies 3x=60\implies x=\cfrac{60}{3}\implies x=20`