Question

One pound of candies costs $3.50.

Answer 1

1 pound costs $3.50
x pounds cost $7
$x = \frac{7 \times 1}{3.50} = 2$
so you can buy 2 pounds of candies for $7

Answer 2

You can set up a proportion to answer this question.  

$\frac{1}{3.5} =\frac{x}{7}$

This says, "If one pound costs $3.50, how many pounds is $7?"

Solve for x by cross multiplying.

7=3.5x

*Divide both sides by 3.5*

2=x

2 pounds of candies can be bought for $7.

Hope this helps!!