Straight Lines

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Straight Lines

Dec 18 2011
by Abdullah Najuib
3 Comments

Problem:

What number can replace the question mark in the puzzle? There is a pattern!

1, 2, 15, 12

-9, 10, 20, 43, -3, -1, -30

8, 17, 4, 1

16, 1, 4, 12, -2, ?

3 Responses to Straight Lines

  1. December 18, 2011
    9:17 pm

    Amr AbuMuslim

    Summing all the numbers in each row will resulting in 30, so, the missed number is “-1″

    Reply
  2. December 18, 2011
    10:50 pm

    Mohamed Ahmed

    the sum of each line is = 30 then we should replace this ‘?’ with -1 .

    Reply
  3. December 23, 2011
    12:26 am

    youssef wagih

    sum = 30 so the ? = -1

    Reply

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