## Question

**If 5 x 4 = 15, 7 x 8 = 49 and 6 x 5 = 24, then 8 x 4 is equal to**

A. 30

B. 28

C. 24

D. 26

#### Answer: C. 24

**Solution:**

As, 5 x 4 = 5 x (4 -1) = 5 x 3 = 15

7 x 8 = 7 x (8 – 1) = 7 x 7 = 49

and 6 x 5 = 6 x (5 – 1) = 6 x 4 = 24

Similarly, 8 x 4 = 8 x (4 – 1) = **8 x 3 = 24**

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IF 5 + 2 = 9, 6 + 3 = 15, 7 + 4 = 23, 8 + 5 = 33 then 10 + 7 = ??