1. 

If '+' means 'x', '-' means '÷', 'x' means '-' and '÷' means '+', then find the value of the given equation 6 + 64 - 8 ÷ 45 x 8 = ?
A. 85
B. 76
C. 87
D. 75

Answer: Option A

Explanation:

Given equation, 6 + 64 - 8 ÷ 45 x 8

Now, changing the sign as per the question,

 6 x 64 ÷ 8 + 45 - 8 = (6 x 64)/8 + 45 - 8

 6 x 8 + 45 - 8 = 48 + 45 - 8 = 93 - 8 = 85