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Question

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

The magic sum is 340.

A
120
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B
130
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C
140
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D
150
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Solution

The correct option is D 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

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