### Question

### Some equations are solved on the basis of a certain system. On the same basis find out the correct answer from amongst the four options for the unsolved equation.

**8*7 = 151 **

6*5 = 111

9*4 = 135

8*3 = ?

6*5 = 111

9*4 = 135

8*3 = ?

A. 124

B. 73

C. 511

D. 115

#### Answer: D. 115

**Solution**:

**LOGIC : : (First Number + Second Number) = First Two Digits of Third Number(First Number – Second Number) = Last Digit of Third Number**

The logic is given below;**In 8*7 = 151 ->**

(8 + 7)(8 – 7) = 151

**In 6*5 = 111 ->**

(6 + 5)(6 – 5) = 111

**In 9*4 = 135 ->**

(9 + 4)(9 – 4) = 135

**In 8*3** = (8 + 3)(8 – 3) = **115**

Hence, **Option (4)** is correct.

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