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Before 4 years the ratio between the age of A and B was 3:4. After 7 years the total of their ages will be 71 years. Find their present age?

The ratio of present age of father and son is 5 : 2 and before 4 years their age ratio was 3 : 1. Then what will be their age ratio after 6 years?

If the present ages of Nandu and Shobit are 20 yr and 24 yr respectively, then find the ratio between the age of Nandu (before 4 yr) and Shobhit (after 4 yr).

On walking 120 m towards a chimney in a horizontal line through its base the angle of elevation of tip of the chimney changes from 30° to 45°. The height of the chimney is :

On walking 120 m towards a chimney in a horizonatal line through its base the angle of elevation of tip of the chimney changes from 30^@ " to " 45^@ . The height of the chimney is

The probability that a man who is 85 years old will die before attaining the age of 90 is 1/3. Four persons A_1,A_2,A_3 and A_4 are 85 years old. The probability that A_1 will die before attaining the age of 90 and will be the first to die is