Question

21 is 70% of what number? remember: is = of ·

Explanation:

Step1: Set up the equation

Let the number be $x$. We know that $70\%$ can be written as $0.7$. The equation based on "is = of" is $21 = 0.7x$.

Step2: Solve for x

Divide both sides of the equation by $0.7$. So $x=\frac{21}{0.7}$.

Step3: Calculate the value of x

$\frac{21}{0.7}=30$.

Answer:

30