Question

A Square of nine numbers is marked in a calendar . The sum of all these number is 90 . what are the numbers

Answer 1

Step-by-step explanation:

Divide the sum (90) by the number of figures (9), you find 10.

the center line of the square will be a row of three numbers with 10 in the middle, i.e. 9 10 11. Its sum is three times 10 (because 9 + 11 = 2 * 10).

That is all. Pick any calendar month whereby 10 is not on a side, and select the square of numbers where 10 in in the center place. Example: October 2018, where 10 is a Wednesday. The square will be Tu We Th on three consecutive lines with 10 in the middle.

2 3 4 Sum of row: 9

9 10 11 Sum of row: 30

16 17 18 Sum of row: 51

Sum of all three rows: 90 QED