Which number should replace the question mark?

17	8	5	5
13	7	5	4
6	12	6	3
10	6	4	?

"

Given:

To find:

The missing number.

Solution:

For each row the sum of the first two columns is equal to the multiple of the last two columns.

Row 1:17 $+$ 8 = 25 and 5 $\times$ 5 = 25

Row 2: 13 $+$ 7 = 20 and 5 $\times$ 4 = 20

Row 3: 6 $+$ 12 = 18 and 6 $\times$ 3 = 18

Now,

In row 4 let the required number be equal to a. So,

10 $+$ 6 = 16 and 4 $\times$ a = 16

16 = 4a

a = $\frac{16}{4}$

a = 4

So, the answer is 4.

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Updated on: 10-Oct-2022

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