Assign correct mathematical signs and find the missing number (?), if 8 2 5 = 20 9 3 6 = 18 then 6 3 9 = ?

If 4 + 5 - 2 = 33 and 10 + 12 - 5 = 119, then 6 + 8 - 3 =

Find the value of x, if: 2 * 3 = 11, 3 * 5 = 23 and x * 6 = 41.

Which of two signs when interchanged makes the following equation correct? 7 ÷ 8 × 2 − 16 + 2 = 15

Which of the following two signs needs to be interchanged to make the given equation correct? 24 − 8 / 4 + 5 × 3 = 14

If 3 × 4 = 1609, 5 × 6 = 3625 and 1 × 2 = 401, then 4 × 7 equals: