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IF you following the question description, you will get a model diagram
like above. Note that there are 2 "remaining"s. One is after she bought
her bag, the other is after she bought her tablet.

For the diagram, it is clear that:
   88 + BAG + TABLET = 700
a. So she spent 700 - 88 = $612.


The u and p are not quite comparable. To make them comparable,
we need 3u = 5p. Since LCM(3,5) = 15, let 3u = 5p = 15s.
That means u = 5s and p = 3s. Re-label the diagram with s as above.
Thus BAG + TABLET = 17s = 612 and so s = 36.
b. She had 20s = 20 x 36 = $720 at first.

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