Question

My little sister wanted me to explain this to her but I forgot... someone please help me

30% of x = 12

Answer 1

x=40

Explanation:

30% is the same as 3/10.

-So now you have 3/10 of x = 12.

The term “of” in the equation is the same as multiplication.

-So now you have 3/10 · x = 12 (the dot is multiplication)

Multiply both sides by the reciprocal of 3/10, which is 10/3

-So now you have x=120/3, which is equal to x=40 (that’s you answer)

You can check your answer by plugging in 40 for x.

30% of 40 is indeed equal to 12.

Hope this helps and answers your question :)

Answer 2

30% = 0.30

0.30x = 12

Divide both sides by 0.30

X = 12/0.30

X = 40