Question
The average of the current ages of Armaan, Biju, Chinky,
and Danny is 31 years. Two years from now, the average age of Armaan and Biju will be 22 years. Given that the present age ratio of Chinky to Danny is 4:3, determine the current age of Danny.Solution
ATQ, Sum of the present ages of ‘Armaan’, ‘Biju’, ‘Chinky’ and ‘Danny’ = 31 × 4 = 124 years Sum of the ages of ‘Armaan’ and ‘Biju’, 2 years hence = 22 × 2 = 44 years Sum of the present ages of ‘Armaan’ and ‘Biju’ = 44 – 2 – 2 = 40 years Sum of the present age of ‘Chinky’ and ‘Danny’ = 124 – 40 = 84 years Present age of ‘Danny' = 84 × {3/(4 + 3)} = 36 years
The speed of sound is maximum in which of the following ?
Which one of the following physical quantities is the same for molecules of all gases at a given temperature?
Two identical metallic spheres are charged. One has +Q charge, the other –Q charge. They are connected by a conducting wire. After equilibrium:
...Two satellites are orbiting Earth at different altitudes. Satellite A is closer than Satellite B. Which of the following is correct regarding their spe...
Which of the following is a characteristic of the acids?
Organisms have been divided into how many kingdoms?
A conducting sphere of radius R carries a charge Q. If half of the charge is transferred to an identical uncharged sphere brought into contact and remov...
Which of the following is an example of storage leaves?
A car travels 150 kilometers in 3 hours. What is its average speed?
Which of the following is the correct term used to describe Graphite, Carbon and Diamonds?
