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Question

90 gifts were distributed in a party. Everyone presented a gift to another. How many persons were there in the party ?

A
9
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B
10
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C
81
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D
89
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Solution

The correct option is C 10
If there will be 10 persons in party, 1 person will have 9 gifts so he can give 1 gift to each other person. Or in other words 1 person will give 9 gifts for another 9 persons.
If 1 person will give 9 gifts to another 9 persons
then 10 persons will give 10×9=90 gifts to another 9 persons.
Thus "Option B" is correct answer.

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