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Bunuel
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Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
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Another way to think of it.

Total chocolates = 9/10c
Total boxed chocolates = Chocolates in each box * Total boxes
Let total box be b+x, where x is the additional number of boxes
Total boxed chocolates = h * (b+x)
Since all boxes can be filled completely, and no chocolate is left behind, Total chocolates = Total boxed chocolates
9/10c = h * (b+x)
x = 9c/10h - b
Bunuel
Amy bought “c” chocolates and some boxes. Each box can hold “h” chocolates. She wants to keep \(\frac{1}{10}\)^th the chocolates for herself and gift the rest to her friend in those boxes she bought. If she has filled “b” boxes completely, how many more boxes can be filled completely, assuming all boxes can be filled completely?

A. \(ch - b\)

B. \(\frac{9c}{10h} - b \)

C. \(\frac{c}{b} - h \)

D. \(ch - b\)

E. \(bh - c\)


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Hello ,
Total chocolates are C and she wants keep 1/10 of c for herself it mean she will give 9/10of c to friends
Each box can hold h chocolates
Number of boxes will be 9C/(10h)
she has filled “b” boxes completely
Additional box will be 9C/(10h)-b

Hence option B is correct
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