In an examination, a student scores 6 marks for every correct answer and loses 4 marks for every wrong answer. If he attempted 80 question and obtained 310 marks, how many questions did he attempted correctly?

The average run of a cricketer after 18 matches was 56.5. If he made 101 runs and 123 runs in 19th and 20th match respectively. What is his new average run after 20th match?

Two types of rice (type 1 and type 2) were mixed in the respective ratio of 1 : 3. The mixture was then sold at the rate of ` 75.60 per kg to gain a profit of 20%. If the price of type 1 rice is ` 75 per kg, what is the price of type 2 rice per kg?

Mr. Shah's monthly income is ` 54550. In an entire year, he spends 32% of his annual salaries on groceries, he spend 12% on repairs and 10% he pays to his servant. If half of the remaining amount he invests in fixed deposits, what is the amount invested by him in fixed deposits?

Two pipes A and B can fill a tank in 3 $3 \over 7$h when opened simultaneously. If B alone can takes 2 h less than A alone takes to fill the tank completely. How much does A alone take to fill the tank?

The respective ratio of two numbers is 16 : 21. If the first number is increased by 30% and the second number is decreased by 20%, what will be the respective ratio of the first and the second number?

A bag of fruits was distributed among 4 students P, Q, R and S. P took 3/8th of the fruits. Q took 1/5th of the remaining fruits and the remaining fruits were equally distributed among R and S. What fraction of fruits did R get?

The present population of village P is 2.5 times the present population of village Q. If after a year the population of village Q is 16537 and has been increased at a rate of 15%. What is the present population of village P?