# Six apples cost 80 cents. At that rate, what is the cost of 15 apples?

## What is the cost of 15 apples?

Feb 24, 2018

15a=$2 #### Explanation: Let's use algebra for this question, as you posted this in algebra: Let's make Apples=$a$$\therefore$this means 6a=$0.80

As we are finding $15$ apples, dividing $15$ by $6$ gives us a scale factor to multiply the value by.

$\frac{15}{6} = 2.50$

Therefore that means that it is $\times 2.5$ more apples, so the value is $2.5$ more

2.50xx$0.80=$2

$\therefore$ 15a=$2 Alternative method: $\frac{15}{6} = \frac{x}{0.80}$letting $x$be the price of $15$apples $\therefore$x=0.80(15/6)=$2

Feb 24, 2018

200 cents, or 2 dollars.

#### Explanation:

All that is required is to find the ratio between the two numbers of apples, and use that to find the second price. For instance, let $x$ be the cost of 15 apples.

Therefore,

$\frac{15}{6} = \frac{x}{80}$

$80 \left(\frac{5}{2}\right) = x$

$x = 200$ cents

Feb 24, 2018