Mrs. Deepa Devi saves 30% of her salary. If she receives Rs.42,000 per month as her salary, what is her monthly expenditure?

A number increased by   $$22{1 \over 2}\%$$ gives 98 as result. The number is: 

In a college the number of students studying Arts, Commerce and Science are in the ratio of 3:5:8 respectively. If the number of students studying Arts, Commerce and Science is increased by 20%, 40%, and 25% respectively, what will be the new ratio of students in Arts, Commerce and Science respectively?

40 % are the passing marks. A student gets 250 marks yet fails by 38 marks. What are the maximum marks? 

In a town, the population was 8000. In one year, male population increased by 10% and female population increased by 8% but the total population increased by 9% . The number of males in the town was:

There are 500 students in a school out of which 60% are boys. 40% of the boys play hockey and girls don’t play hockey. 75% of the girls play badminton. If there are only two games to be played, number of students who don’t play any game.