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How many bottles do you think he can buy in exchange of those 77 empty bottles ?

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A shopkeeper allows people to buy a bottle of cold drink in exchange of five empty bottled. A guy had a party at home and he managed to spend 77 cold drink bottles in the party. Now he has 77 empty bottles with him.

How many bottles do you think he can buy in exchange of those 77 empty bottles ?

posted Jul 20, 2015 by Atif

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1 Solution

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19 in total.
15 in the first go.
But if he also drinks those bottles, he can buy another 3
And drinking those gets him another 5 (3 + 2 left over from 77), getting him another bottle
15 + 3 + 1 = 19 bottles.

solution Jul 21, 2015 by Jcm



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