Your mother is 4 years younger than your father and your father is 6 times older than you. If you are 6 years old, what is your mother's age?

Which two signs should be interchanged to make the following equation correct?
20 ÷ 20 + 20 – 25 × 25=419

Select the correct set of symbols which will fit in the given equation 5 0 3 5 = 20 

If 2 is added to each even digit and 1 is subtracted from each odd digit in the number 945217, then what will be the sum of number/numbers not repeated in the new number?

If ‘+’ means ‘-‘; ‘-‘ means ‘×’; ‘×’ means ‘÷’ and ‘÷’ means ‘+’, then
25×5÷30+8 – 2 =?

If P means -, Q means +, R means x and  S means ÷ then what is the value of  8 R6S3Q5P9 

Mohit and Sudesh bought pens and notebooks from the same shop. Mohit bought 3 pens and 6 notebooks by paying an amount of ₹180. Sudesh bought 5 pens and 2 notebooks by paying an amount of ₹116. How much did Mohit spend on buying notebooks?

Identify the symbols to be inserted to make the expression correct.
24 Δ 4 Δ 5 Δ 4