Which number should replace the question mark?

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Which number should replace the question mark?

   5       12       15
   7        9        4
  23       87        ?

posted Dec 12, 2017 by Brijesh Talwar

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1 Answer (Check Answer ▼)

The answer is 41
EXPLANATION:
Each number in the third row is the difference of the product and sum of the numbers in the same column of the first and second rows.
C=A×B−(A+B)
5×7−(5+7)=35−12=23
12×9−(12+9)=108−21=87
15×4−(15+4)=60−19=41

answer Dec 17, 2017 by Yasin Hossain Siinan

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