**55** is **10%** of **550**

#### Working out percentage problems of the form "55 is 10 percent of what number?"

- We have, 10% ×
**x** = 55 - or, 10/100 ×
**x** = 55 - Multiplying both sides by 100 and dividing both sides by 10,

we have **x** = 55 × 100/10 **x** = **550**

If you are using a calculator, simply enter 55×100÷10, which will give you the answer.

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