For every 3 packages that Marcella wraps, she uses 1/2 of a roll of wrapping paper. If she uses 2 1/2 rolls of wrapping paper, how many packages has she wrapped?
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She has wrapped 15 packages.

Step-by-step explanation:

Heres how I did it. I used my fingers for this, it's a little odd I know but it works. I put up one finger for each half. So each finger represents one half. I needed to get to 2 1/2 so I put up two finger and I said "that's one " because a half plus a half is a whole or just one. Then I put up one more finger and I said " That's one and a half". I then put up two more and then I had 2 1/5. What I did then was count how many fingers I had up. I had 5 fingers up. So then I multiplied 3 x 5 and that gave me 15. Hope I could help!

4 packs of water and 7 packs of candy bars

step-by-step explanation:

35x4=140

140/20=7

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step-by-step explanation: