# A local hardware store sold 12% of its hammers on Saturday. If the hardware store began with 350 hammers on Saturday, how many hammers were left at the end of the day?

Jan 10, 2017

There were 308 hammers left at the end of Saturday.

#### Explanation:

We can write the equation for this problem as:

$r = h - s$

Where:

$r$ is the hammers remaining - what we are trying to calculate.
$h$ is the number of hammers to start - 350
$s$ is the number of hammers sold - 12% so 350.

We will need to first calculate s:

"Percent" or "%" means "out of 100" or "per 100", Therefore 12% can be written as $\frac{12}{100}$.

When dealing with percents the word "of" means "times" or "to multiply".

Putting this altogether we can write this equation and solve for $s$ while keeping the equation balanced:

$s = \frac{12}{100} \times 350$

$s = \frac{4200}{100}$

$s = 42$

We can number solve the equation for the remaining hammers by substitution:

$r = 350 - 42$

$r = 308$