Question
Currently, the ages of 'P' and 'Q' are in the ratio of
4:9. 'Y' years in the past, the ratio of their ages was 1:3. Three years from now, 'P' will be half as old as 'Q' is today. Determine the value of 'Y'.Solution
Let the present ages of 'P' and 'Q' be '4x' years and '9x' years, respectively. ATQ: 4x + 3 = 9x ÷ 2 Or, 8x + 6 = 9x So, 'x' = 6 Present age of 'P' = 4x = 4 X 6 = 24 years And present age of 'Q' = 9x = 9 X 6 = 54 years ATQ; {(24 - Y) /(54 - Y) } = (1/3) Or, 72 - 3Y = 54 - Y Or, 18 = 2Y So, 'Y' = 9
Quantum Theory was discovered by?
Which of the following does NOT exemplify Potential Energy?
In the atmosphere ultraviolet rays are absorbed by –
The Mud festival ‘Chikhal Kalo’ is celebrated in which state?
What is the power of a lens whose focal length is 1 m?
What is the speed of light in air?
In which form is the supplied heat energy stored during change in temperature of substance?
S.I unit of Luminous Intensity is
Which of the following statements is true when we see 'rainbow'?
Which of the following Instrument is used to measure humidity?