By interchanging the given two signs, which of the following equations will NOT be correct?
 × and –
 I. 17 – 21 + 86 ÷ 2 × 13 = 387
 II. 10 + 63 – 12 × 259 ÷ 7 = 739

After interchanging which two signs will the value of the given expression be ‘356’?

133 + 49 – 16 ÷ 2 × 34

After interchanging the two numbers 3 and 6, what will be the value of the given expression?

12 × 3 ÷ 6 + 8 – 2

Which of the mathematical signs should be interchanged in the given equation to make it mathematically correct?

31 ÷ 14 × 9 + 3 − 7 = 66

By interchanging the given two numbers (not digits), which of the following equations will be correct?

44 and 19

I. 203 + 44 – 27 × 19 ÷ 11 = 114

II. 9 × 572 ÷ 19 – 44 + 4 = 120

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

If 98 – 39 – 27 = 31, 87 – 38 – 34 = 20, then 79 – 25 – 12 = ?

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

If 1 + 4 = 9, 2 + 8 = 18, 3 + 6 = 15 then 7 + 8 =?

Which of the following interchanges in signs and numbers will make the given equation correct?

8 x 6 + 4 = 52