In the following question, by using which mathematical operator will the expression become correct?
18 ?6 ? 9 ? 27

In the following question, correct the equation by interchanging two signs.
9 x 3 + 8 ÷ 4 – 7 = 28

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

What will be the difference between the first digit of the highest number as well as of the lowest number after the positions of the first two digits in each number of the following series 738, 429, 156, 273, 894 are reversed?

If ‘-’ stands for ‘division’, ‘+’ for ‘multiplication’, ‘÷’ for ‘subtraction’ and ‘×’ for ‘addition’, which one of the following equations is correct? 

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

31 ÷ 14 × 9 + 3 − 7 = 66

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

17- 15 x 5 = 250

If ‘+’ means ‘divided by’ ‘-’ means ‘add’, ‘×’ means ‘minus’ and ‘/’ means ‘multiplied by’, what will be the value of the following expression?
[{(5 × 10) - (16/4)} + (15 - 9)]/0