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1. 21 is what % of 30?2. what is 25% of 160?Answer #1

User Jon Sakas
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1. Since you need to find whar percent is 21 of 30, you can identify that the 100% is 30.

Let be "x" the percent asked in the exercise.

Using the information provided in the exercise, you can set up the following proportion:


(100)/(30)=(x)/(21)

Now you must solve for the variable "x" in order to find its value:

- You can apply the Multiplication property of equality by multiplyin both sides of the equation by 21. Then:


\begin{gathered} (21)((100)/(30))=((x)/(21))(21) \\ \\ (2100)/(30)=x \end{gathered}

- Divide the numerator by the denominator:


x=70

The answer is: 70%

User Xmux
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