How many classes are there in the given picture?

If A # B means A + B, A $ B means A - B, A % B means A X B and A & B means A ÷ B, then what is the value of '154 & 22 % 5 $ 68 # 84'?

If 'A' stands for '+', 'B' stands for '-', 'C' stands for ' X ', 'D' stands for '÷', what will come in the place of (?) in the following equation?

Which among the given operators should replace the “%” (in the same order) in the given expression below:

7 % 12 % 7 % 38 % 47 % 8

If + denotes ÷, × denotes -, - denotes ×, and ÷ denotes +, what is the value of the following expression:

124 + 4 × 5 – 6 ÷ 6 + 3 = ?

Select the correct combination of mathematical signs that can sequentially replace the sign * and make the equation correct.

8 * 12 * 7 * 5 * 3 * 201

If P is coded as '÷', Q is coded as '+', R is coded as '-' , and S is coded as 'x' , then what is the value of the following expression?

Select the correct combination of mathematical signs that can sequentially replace the ‘*’ signs and balance the given equation.