Question

21 is 30% of what number? round to the nearest whole number.

Explanation:

Step1: Define the variable

Let the number we are looking for be \( x \). We know that \( 30\% \) of \( x \) is 21. Mathematically, this can be written as \( 0.30x = 21 \) (since \( 30\% = \frac{30}{100}=0.30 \)).

Step2: Solve for \( x \)

To find \( x \), we divide both sides of the equation \( 0.30x = 21 \) by \( 0.30 \). So, \( x=\frac{21}{0.30} \).

Step3: Calculate the value

Calculating \( \frac{21}{0.30} \), we get \( x = 70 \). Since 70 is already a whole number, we don't need to round it further.

Answer:

70