Question

20 is 50% of what number? If necessary, round to the nearest tenth.
Is it 10.0?

Answer 1

if 20 is 50% of a number it is just going to be 20 times 2... so it is 40

Answer 2

Because 50% is the same as .5 or 1/2, that means 20 is half of the original number.
20+20=40
40 is the correct answer.