Which two numbers from amongst the given options should be interchanged to make the given equation correct?
 248 ÷ 4 + 184 ÷ ( 4 × 6 – 2 × 8) = 77

Which two signs should be interchanged to make the given equation correct?
 48 ÷ 12 × 3 + 5 − 4 = 21

Which of the following interchange of mathematical signs would make the given equation correct?
 20 ÷ 4 × 8 + 16 − 15 = 11

Which two signs need to be interchanged to make the following equation correct?

9 + 3 − 4 ÷ 5 × 2 = 9

Select the correct combination of mathematical signs to replace the * signs sequentially and balance the given equation.
 99 * 33 * 66 * 22 * 44 * 50

Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.
 23 * 2 * 2 * 5 * 18

Direction: Some equations have been solved on the basis of certain system. Find the correct answer for the unsolved equation on that basis.

If 24 × 2 = 84, and 32 × 3 = 69, then 13 × 3 = ?

If ‘+’ means ‘÷’, ‘ ̶ ’ means ‘+’, ‘×’ means ‘ ̶ ’ and ‘÷’ means ‘×’, what will be the value of the following expression?
 [{(32 × 20) - (2 ÷ 3)} + (2 - 4)] ÷ 3