In a class , the number of girls is 20% more than that of boys. The strength of the class is 66. If 4 more girls are admitted to the class , the ratio of the number of boys to that of the girls is -

If x: y =5:2 , then (8x+9y) : ( 8x +2y) is

Two number are in the ratio 3:5 . If 9 is subtracted form each , the new numbers are in the ratio 1223. The sm...

A monkey climbs a 60 m high pole.s In first minute he climbs 6 m and slips down 3 m in the next minute. How mu...

Two trains 105 meters and 90 meters long, run at the speeds of 45 km/h and 72 km/h respectively , in opposite...

The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance traveled downs...

A bag contains 2 red, 3 green and 2 blue balls .Two balls are drawn at random. What is the probability that no...