This calculator will help you solve X percent of what number is Y. Enter the percent in the first input box and Y in the second box and press calculate. The calculator will display a step by step tutorial on how to arrive on the answer.

**What is percentage?**

Before you learn how to find Percent of what number is Y, you need to know what percentage is. It refers to the representation of a number as a ratio of 100. Percent is derived from the word per 100.

**How to solve X percent of what number is Y**

Follow the examples below to find out how you can solve X percent of what number is Y.

**Example 1: ****50 percent of what number is ****20**

We know the percentage and the answer but not the number.

**Step 1:** Write the problem as an expression

50/100 x X = 20

**Step 2:** Simplify the expression

X= 20 x 100/50

**Step 3:** 2000/50

=40

Therefore **50** percent of **40** is **20**

**Example 2: 70 percent of what number is 10**

**Step 1: **Write the problem as an expression

70/100 x X =10

**Step 2:** Simplify the expression

X= 10 x 100/70

**Step 3:** 1000/70

X= 14. 29

Therefore **70** percent of **14.29** is **10**

**Example 3:** **42 percent of what number ****90**

**Step 1:** Write the problem as an expression

42/100 x X = 90

**Step 2:** Simplify the expression

X= 90 x 100/42

Step 3: 9000/42

=214.29

Therefore **42** percent of **214.29** is **90**

**Video tutorial**

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