# Built-up area

John build up area 5 x 7 = 35 m

^{2}with building with a wall thickness 30 cm. How many centimeters would have to subtract from thickness of the walls that built-up area fell by 9%?### Correct answer:

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#### You need to know the following knowledge to solve this word math problem:

**algebra**- quadratic equation
- inequalities
**arithmetic**- comparing
**planimetrics**- rectangle
**basic functions**- percentages

#### Units of physical quantities:

#### Grade of the word problem:

We encourage you to watch this tutorial video on this math problem: video1

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