Rahul’s age is three times the age of Sumit. If Rahul is 15 years old presently, determine the age (in years) of Sumit after 12 years. 

If the mathematical operator ‘÷ ’ means ‘×’, ‘+’ means ‘–’, ‘×’ means ‘+’ and ‘–’ means ‘÷ ’, then 24+48–12×4÷ 2=?

Two years ago, Roshni's age was 3 times her son's age, and 2 years later, 2 times her age would be 5 times her son's age. Find the current age of Roshni.

If ‘+’ means ‘-‘, ‘-‘ means ‘x’, ‘x’ means ‘÷’ and ‘÷’ means ‘+’, then what will be the value of the  following expression?
27 – 2 + 24 × 8 ÷ 4

If "–" stands for division, "+" stands for multiplication, "÷" stands for subtraction and "×" stands for addition, which of the following equations is correct?

A family consists of a grandmother, father, mother, and their four sons with their respective wives. Further, each son has a daughter and two sons. How many females are there in all?

Ali travels a distance of 300 m in 2 minutes and 30 seconds. What is his speed in kmph?

The average age of father and his son is 22 years. The ratio of their ages is 10 : 1 respectively. What is the age of the son?