Question

7 6 12

5 5 7

4 6 ?

168 90 168

Answer 1

Given :

7 6 12

5 5 7

4 6 ?

168 90 168

To find :  ?

Solution:

7 6 12

5 5 7

4 6 ?

168 90 168

7  5  4    168

7 * ( 5 + 1) * 4 / 1   = 7 * 6  * 4 = 168

6  5  6   90

6 * (5 + 0) * 6  / 2  = 6 * 5 * 3 = 90

12   7   ?         168

?   =x

12 * (7 - 1) * x / 3  = 168

=> 4  * 6  * x = 168

=>  x = 7

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