algebra
posted by me .
50% of what number is 10?

0.5x = 10
x = 10/0.5
x = ? 
x=5?

Number x .5 = 10
20 X .5 = 10
make 50% into a decimal equivalent by making 50% into a fraction. 50/100 is .5 
Does 5 make sense?
Is 10 half of 5?
Please try again. 
10 is half of 20

x = 20

0.5x = 10
x = 10/0.5
x = 20
All you have to do is divide 10 by 0.5 and you'll get 20.