1
$\begingroup$

What is x?

-----
| 22 |
----------
| 34 | 23 |
----------
| 57 |
-----

-----
| 43 |
----------
| 78 | 29 |
----------
| 16 |
-----

-----
| 52 |
----------
| 94 | 28 |
----------
| 35 |
-----

-----
| 62 |
----------
| 71 | x  |
----------
| 23 |
-----

There is a connection between the numbers. The same connection applies to all four parts and then we can find x.

I tried to do it, but couldn't solve. In the first one, 22+23+57=112 and 34*3=102, so 112-10=102. This method doesn't apply to the others. Added altogether to no avail. Multiplied digits, still no answer.

The answer shown on the booklet is 21.

Source: The question is asked in YTUYOS 2017 booklet A, question no: 57. These are the questions asked in university entrance exam for international students in Turkey. These types of questions should not take more than 2 minutes to solve and generally they do have only one answer. In case they have more than one then the question is cancelled.

$\endgroup$
4
$\begingroup$

The answer is indeed:

21

This is because, simply:

The number on the right is the sum of all of the digits in the three left-hand boxes:

(2 + 2) + (3 + 4) + (5 + 7) = 23
(4 + 3) + (7 + 8) + (1 + 6) = 29
(5 + 2) + (9 + 4) + (3 + 5) = 28

and thus:

(6 + 2) + (7 + 1) + (2 + 3) = 21

$\endgroup$
1
  • 1
    $\begingroup$ Thank you. I couldn't think that way when I was trying to solve it. Good approach, I appreciate it. $\endgroup$
    – garakchy
    Jul 15 '20 at 22:10

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.