Explain the strategy you used to solve this problem?

Question

10% of 20

Answer 1

I multiply: 0.1 * 20

Answer 2

put it like this

100% is 20 then
10% is x

now you just have to cross multiply
so u get .....

100x=(20) * (10)
therefore, x=(20)*(10)/100
x=2

Answer 3

x=2