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?
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?
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?