There are two bags. One contains 4 white & 5 Black balls, another contains 4 white & 3 black balls. If one ball is drawn from the first bag and kept in another bag unseen then the probability of choosing a black ball from the second bag is:
A lends Rs. 4000 to B and a certain sum to C at the same time at 7% per annum simple interest. If after 5 years, A receives Rs. 3500 as interest from B and C. What is the difference of sums given to B and C by A?
10 years ago average age of 4 members of a family was 24 years. Two children were born and current average of 6 members is 24 years. If the age difference in both children is 2 years then find the age of the younger child.
There are two sections A and B of a class consisting of 40 and 44 students respectively. If the average weight of section A is 35 kg and that of section B is 37 kg, find the average weight of the whole class.