Question

There are 400 tiles to be removed, and you have removed 280 of them so far. What percent of the tiles do you still have to remove?

Answer 1

The answer to you problem is, 30%

Explanation:

First lets do some subtraction:

400 - 280 = 120.

So we want to know what is half:

400 / 2 = 200.

80 units away from 200.

10% of 400 = 40.

120 / 400 = 0.3. Make it in percetage:

0.3 x 100 = 30%

? x 100 = ? <--- Use this formula to find out percetage.

Thus the answer to your problem is, 30%