Maggie is making a necklace using 13 inch string and identical beads. maggie has placed 15 beads next to each other starting on the left end of the string as shown in the figure. the 15 beads fill 5 inches of the string. how many total beads will completely fill the 13 inch string?

I think you would go like this: If 15 covers 5 inches then I know I am going to need at least 30 but I have 3 more spaces so I have to divide 5/15 (That is 15 divided by 5) The answer is 3 so I have to go 3 x 3 which is 9 and then I add
9 to 30 which is 39 so there is my answer. If I did it incorrect please tell me. :). I hope it helps.

3/4-2/4=1/4 farther than sarah