Question

3 out of 20 boxes are damaged what percent is damaged?

Answer 1

'out of' generally indicates division

So 3 out of 20 boxes, is basically the same as 3 ÷ 20.

3 ÷ 20 = 0.15

To work out the percentage, you have to multiply this value by 100 (per CENT, cent means 100 in Latin).

0.15 × 100 = 15%.

The answer is 15% of the boxes are damaged. 

Answer 2

The answer is 15%.
Just divide 3 and 20.