Question

How do you do this problem? It isn't C is all I know.

Answer 1

First we must find what 45% of 210.5 ft is. there are two ways to find the percentage, multiplication or a ratio.

Since it's 45% OF 210.5 ft we know it will be multiplication because of means to multiply.
$210.5 \times 0.45$
It would look like this becuase a percentage is a decimal answer. we'd find that by moving the decimal place two places to the left.

94.725 would be the result if 45% of 210.5

We will still to to subtract but first let me show you how to do it with ratios.

To do this we set it up like so.

$\frac{45}{100} = \frac{?}{210.5}$
We know that the percentage 45 is out of 100 percent. we also know that 210.5 is the whole number we are trying to find the fraction of. Therefore 210.5 would be equivalent to the 100 because 210.5 is the entire number (210.5/210.5).

First we divide 210.5 by 100 to figure out how much to multiply the numerator by to find the number (or numerator) over 210.5.

We come up with the number 2.105

We then multiply that number by 45 to find the numerator of the fraction of 210.5

45 × 2.105 = 94.725

Now to find the remainder of fencing left we subtract 94.725 from 210.5 since we only found out what 45% of 210.5 is not how much is left over.

We come up with an answer of 115.775 ft which we round to 115.78 ft of fencing.