Question

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

What is the cost of 15 apples?

Answer 1

`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.

`15/6=2.50`

Therefore that means that it is `xx2.5` more apples, so the value is `2.5` more

`2.50xx$0.80=$2`

`therefore` `15a=$2`

Alternative method:

`15/6=x/0.80` letting `x` be the price of `15` apples

`therefore` `x=0.80(15/6)=$2`

Answer 2

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,

`15/6 = x/80`

`80(5/2) = x`

`x = 200` cents

Answer 3

`200c = $2`

Explanation:

• The number of apples and the price of the apples are directly proportional.

`80/6 = x/15" "(larr"price")/(larr "number of apples")`

`x = (80xx15)/6`

`x = 200c`

• You can also increase `80` in the ratio `15 :6`

`80 xx 15/6 = 200c`

• You can find the price of `1` apple first

`80 div6 = 13 1/3 c` per apple

`15 xx13 1/3 = 200c`