90 percents of 200 is 180?
Step 1: Translate the words into an equation.
90 percents | of | what | is | 180 |
90% | $ \cdot $ | x | = | 180 |
Step 2: Express $ 90% $ as a decimal number.
$$ 80\% = 80 \div 100 = 0.9$$Step 3: Solve for $ x $.
$$ \begin{aligned} 0.9 \cdot x &= 180 \\[1.2 em] x &= \dfrac{ 180 }{ 0.9 } \\[1.2 em] x &= 200 \end{aligned} $$