# 15% of 80 is what?

Nov 17, 2016

$12$ is 15% of $80$. See Explanation.

#### Explanation:

So we are asked what 15% of $80$ is.
2. Figure out "plan of attack"
So the best way that there seems to be to solve this problem is making a proportion.
3. Solve
$x$ is to $80$ as
$15$ is to $100$

(We are using $100$ because 15 % is out of 100 %)

4. Cross multiply
$x$ $\cdot$ $100 = 15$ $\times$ $80$

5. Carry out what multiplication that can be done
$100 x$$=$ $1 , 200$

6. Divide both sides by $100$
$x$$=$ $12$
And there is your answer, $12$.
$12$ is 15% of $80$

You can double check your answer by plugging these numbers, including $12$, back into the proportion.

$12$ is to $80$ as
$15$ is to $100$
$12 \times 100$ $=$ $80 \times 15$
$1 , 200 = 1 , 200$

Hope this helps!