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Questions  >>  Olympiad-Math  >>  Class 6  >>  Math  >>  Percentages
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In a set of 4 numbers, the average of first 3 numbers is 16 and that of the last 3 numbers is 15. If the last number is 18, the first number is


( A ) 21
( B ) 23
( C ) 20
( D ) 25

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