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Crazy math? (Posted on 2008-10-10)

If:

13 + 10 = 24 and
19 - 11 = 7 and
5 x 4 = 29 and
14 / 2 = 4

What is 23 / 5?

See The Solution Submitted by pcbouhid

Rating: 2.5000 (2 votes)

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Explanation for Puzzle Answer

Comment 7 of 7 |

(In reply to Puzzle Answer by K Sengupta)

a € b -> (a+1)€ (b+1) - 1, where € represents any of the four operators +,-,× and /.

In other words, one is added to each of the two numbers on the lhs, and the result is lessened by 1.

Accordingly,

13 + 10 -> (13+1) + (10+1) - 1 = 14+11-1= 24

19 - 11 -> (19+1) - (11+1) -1 = 20-12-1= 7

5 x4 -> (5+1) x (4+1) - 1 = 6x5 -1 = 30-1 = 29

Thus, we must have:

23/5 -> (23+1)/(5+1) - 1 = 24/6 -1 = 4-1= 3

Edited on March 11, 2022, 9:24 pm

Posted by K Sengupta on 2022-03-11 21:14:11

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