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BECE Mathematics 2015 Paper

Question : 36

Total: 40

Solution:

Concept:

In a magic square, every row, column, and diagonal has the same total.

Explanation:

First, find the common sum using the first row:

13 + 12 + 17 = 42

So, every row, column, and diagonal must also sum to

42

Use the first column, which contains

E

13 + E + 11 = 42

Simplify:

E + 24 = 42

Subtract

24

from both sides:

E = 42 - 24

Therefore,

E = 18

Answer:

E = 18

Correct option: C. 18

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