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Fill in the blank (Posted on 2002-05-20) Difficulty: 3 of 5
What is the "row heading" of the third row (marked with the question mark) in the table shown below?
    4 :  6, 11,  7
    3 :  8,  4, 12
    ? : 10, 55, 15
Explain the scheme used.

See The Solution Submitted by levik    
Rating: 3.3333 (6 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution Puzzle Solution Comment 3 of 3 |

We observe that:
(6+11+7) = 24 = 6*4
(8 + 4 + 12)= 24 = 8*3

Hence, the sum of the second, third and fourth numbers in a row
= product of the first and the second numbers

Let the missing number be x.

Then,
10x = 10 + 55+ 15 = 80,  so that x = 8

Hence the required number is 8.

Edited on February 6, 2009, 3:28 pm
  Posted by K Sengupta on 2007-03-30 04:58:32

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