Question

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

Answer 1

20 is 50% of 40.

Explanation:

1% = 1/100

50% = 50/100 or 1/2

1/2 = 20/n

1*20/2*20 = 20/n

20/40 = 20/n

n = 40