Damini is twice as old as Hari. Hari is 5 years older than Nipa. In 5 years, Damini will be three times as old as Nipa. How old is Hari now?

Which of the following least number can be subtracted from 2486 to make it a perfect square?

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

Ram was twelve times as old as his son twenty years ago. Now he is twice as old as his son. What are the present ages of the son and Ram?

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?

If "÷" denotes "multiplied by", "+" denotes "subtracted from", "x" denotes "added to" and "–" denotes "divided by",then
12 – 6 + 28 × 3 ÷ 9 = ?

Select the correct combination of mathematical signs to replace * signs and to balance the following equation.

(18 * 9 * 14) * 37 * 4