[Solved] 21 is what percent of 30

21 is 70 percent of 30. In this post, we will learn how to find what percent of 30 is 21. This can be asked another way as follows: 21 is what percent of 30?

Question: What percent of 30 is 21?

Solution:

Let y percent of 30 be equal to 21. Mathematically,

30 × y% = 21.

As we know that x% = x/100, the above equation can be rewritten in the following way.

30 × $\dfrac{y}{100}$ = 21

⇒ $\dfrac{30y}{100}$ = 21

Cross-multiplying we get that

30 y = 21 × 100

⇒ y = $\dfrac{21 \times 100}{30}$

⇒ y = $\dfrac{21 \times 10{\color{blue}\cancel{0}}}{3 {\color{blue}\cancel{0}}}$

⇒ y = 210/3 = 70

Therefore, 70% of 30 is equal to 21.

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Remark:

If you want to calculate what percent of 30 is 21 using a calculator, then type the following:

21÷30×100

This will give you 70.

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