Question

What number will come in the yellow box if the given square is a magic square?

The magic sum is 340.

• A. 150
• B. 140
• C. 130
• D. 120
  

Answer 1

The correct option is A 150

The sum of numbers in any row or column or diagonal of the magic square is the same.
The magic sum = 340

The sum of numbers in 4th row
= 140 + 110 + 40 = 290.
Missing space in 4th row
= 340 - 290 = 50

Now,
The sum of numbers in 3rd column
= 160 + 30 + 50 = 240.
Missing space in 3rd column
= 340 - 240 = 100


Now,
The sum of numbers in 3rd row
= 10 + 80 + 100 = 190.
Missing space in 3rd row
= 340 - 190 = 150
The value in yellow box will be 150