The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of girls is 15.4 years. The ratio of the number of boys to the number of girls in the class is (a) 1 : 2             (b) 2 : 3                      (c) 3 : 4                      (d)3 : 5

Question ID - 50925 :- The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of girls is 15.4 years. The ratio of the number of boys to the number of girls in the class is (a) 1 : 2             (b) 2 : 3                      (c) 3 : 4                      (d)3 : 5

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Let the ratio be  Then,

Required ratio = =2 : 3.

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 Four smooth steel balls of equal mass at rest are free to move along a straight line without friction. The first ball is given a velocity of 0.4 . It collides head on with the second one elastically, the second one similarly with the third and so on. The velocity of the last ball is a) 0.4 b) 0.2 c) 0.1 d) 0.05