Age of ‘A’ after 12 years will be three time of his age 20 years ago. Eight years hence from now, ratio of ages of ‘A’ and ‘B’ will be 2:3, respectively. If present average age of ‘A’, ‘B’ and ‘C’ is 40 years, then find the present age of ‘C’.
Let present age of ‘A’ be ‘a’ years So, 3(a – 20) = a + 8 Or, 3a – 60 = a + 8 Or, 2a = 68 Or, a = 34 Present age of ‘B’ = 3/2 × {34 + 8} – 8 = 63 – 8 = 55 years Present age of ‘C’ = 40 × 3 – 34 – 55 = 31 years
Which set of the following gases is most important for greenhouse effect?
Which one of the following gases is considered as atmospheric pollutant –
(a) Ozone (b)
The scientific name of vitamin B12 is :
Which part of cinnamon tree is used in medicines?
Consider the following statements about Project Kuiper:Â
1.   Amazon recently signed an agreement with NASA to support this Project.
...
At ________ the centigrade and Fahrenheit scales are equal.
Which one of the following is responsible for nuclear fission?
Which is used as red pigment in making batteries, lead glass and rust proof primer paints?
 Which type of Fire extinguisher is used for Petroleum fire?Â
Bell metal is an alloy of–