estimate: 20 is 22% of what number? a 40 b 50 c 75 d 100
estimate: 20 is 22% of what number? a 40 b 50 c 75 d 100
Answer
Explanation:
Step1: Set up the equation
Let the number be $x$. We know that $22%$ of $x$ is $20$, so $0.22x = 20$.
Step2: Solve for $x$
$x=\frac{20}{0.22}\approx90.91$. But we can also estimate. $22%\approx20%=\frac{1}{5}$. If $20$ is $\frac{1}{5}$ of a number, then the number is $20\times5 = 100$.
Answer:
D. 100