A man is 3 years older than his wife and four times as old as his son. If the son becomes 15 years old after 3 years, what is the present age of the wife? 

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

Mouni is 2 years elder than Sanjay. If the age of Sanjay 10 years ago was 13 years, then Mouni's present age is

If 1 apple is equal to 6 bananas, how many bananas will be equal to 12 apples?

If ‘+’ stands for division, ÷ stands for multiplication, multiplication stands for addition; then which one of the following equation is correct?

If 5=10, 6=18, 7=28 then 8=?

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?

A man takes 6 km distance to go around the rectangular area. If the area of the rectangle is 2 sq. km. find the difference between length and breadth.