In an imaginary mathematical system, symbol ‘-‘ stands for addition, symbol ‘+’ stands for division, symbol $ ‘\times’ $ stands for subtraction, and symbol $ ‘\div’ $ stands for multiplication. What is the value of the following expression?
$ 144\times 35 + 7 \div 12 – 3 $

Options:
a) 87
b) 95
c) 107
d) 43

Solution:

$ 144\times 35 + 7 \div 12 – 3 $
Change symbol = per Question
$ 144 – 35 \div 7\times 12 + 13 $
$ 144 – 5 \times 12 + 3 $
$ 144 – 60 + 3 $
147 – 60 = 87

Answer: a) 87