What is the quantity of water should be added to a 75 litre mixture of milk and water so that the percentage of milk in the mixture decrease from 75% to 45%?

A cricketer had a certain average of runs for his 64 innings. In his 65th innings, he is bowled out for no score on his part. This brings down his average by 2 runs. His new average of runs is: 

A man starts going for morning walk every day. The distance walked by him on the first day was 2 km. Everyday he walks half of the distance walked on the previous days. What can be the maximum total distance walked by him in his life-time?

A scientist mixes 10% water in his solution but he is not content with it so he again mixes 10% more water in the previous mixture. What is the profit percentage of the scientist if he sells it at cost price:

The current ages of Sonali and Monali are in the ratio 5:3. Five years from now, their ages will be in the ratio 10:7 Then, Monali’s current age is:

What is the predecessor of 218010?

Study the following graph and answer the question that follow.
From which institute is the difference between the appeared candidates and passed candidates maximum?

In a school of 1200, students were asked how they travelled to school. The information obtained is depicted by a pie-chart as below. From the given information find how many students come to school by Car?