One boy from a group of eight boys left and a new boy with a weight of 56 kg joined the group, which resulted in an average weight of 2.5 kg has increased, what is the weight of the new boy?

12 men can do a work in X days. 20 women can do the same work in (X -1) days. 15 men can do the work in y days while 30 women can do it (Y- 2) days . Find the value of X. 

20 men could complete a work in 80 days. They worked together for 60 days, after that due to bad whether the work is stopped for 10 days. How many more men should be employed so as to complete the work in time?

A bank offers 20% compound interest per half year. A customer deposits Rs 7600 each on 1^st January and 1^st July of a year. At the end of the year, the amount he would have gained from interest is –

Find the value of x in the given figure.

A batsman in his 20th innings make a score of 110 and there by increases his average by 4. What is his average after 20 innings? 

In a test a student got 30 % marks and failed by 25 marks. In the same test another student got 40 % marks and secured 25 % marks more than the essential minimum pass marks. The maximum pass marks for the test were?