Im not sure the formula for this- John bought 200 yards of paper for $1.95. Jack needs 40 yards of paper how much will it cost Jack for the paper ?

40 yards *(1.95 dollars / yard) = ? dollars

Whoops, excuse me. I forgot John bought 200 yards.

40 yards *(1.95 dollars / 200 yards) = ? dollars

I don't interpret this question the same as Damon. I interpret it to mean John bought 200 yards of paper for 1.95 (TOTAL) which makes the cost per yard of $1.95/200 yards = $0.00975/yard.

Then Jack must pay, provided the cost is the same;i.e., no discount for larger amounts, 0.00975/yard x 40 yards = ??

Same interpretation now. :-)

I did not misinterpret. I forgot :)

Set it up like a proportion

200 yds 40 yds
------- = ------
$1.95 x

Mutiply top to bottom then divide by your other number

1.95 x 40 = 78
then 78 divided by 200 = $ .39

To find out how much it will cost Jack for the paper, we can set up a proportion using the information given. A proportion is an equation that states two ratios are equal.

We know that John bought 200 yards of paper for $1.95. By setting up a proportion, we can find out how much Jack needs to pay for 40 yards of paper.

Let's set up the proportion:

Amount of paper / Cost of paper = Amount of paper / Cost of paper

Since we want to find out how much it will cost Jack, we can assign the amount of paper Jack needs as "x", and the cost of paper for Jack as "y". The equation becomes:

40 / y = 200 / 1.95

To solve for "y", we can cross-multiply:

40 * 1.95 = 200 * y

78 = 200y

Divide both sides by 200 to solve for "y":

y = 78 / 200

y ≈ 0.39

Therefore, it will cost Jack approximately $0.39 for the 40 yards of paper.