The simple interest on an amount at the rate of 7 percent for five years is Rs 700. So how much is the principal?

An examination was conducted for five subjects where the maximum marks for each subject was 100. Scored 82,97, 88 and 91 marks in 4 subjects respectively. If his total marks were 90 percent, then how many marks did he get in fifth subjects?

30 dozen walnuts were purchased for Rs. 14400 and 32 packets of walnuts (20 walnuts in each packet) were purchased for Rs. 57600. If a packet of Akharato was sold for five rupees in a pack at Rs. 432, what would be the profit percentage?

The total surface area of a cube is 864 square cm. What will be its volume?

The owner of a bike buys petrol for 3 years continuously at Rs 64, Rs 80 and Rs 320 per litre respectively. If he spends Rs 32,000 every year buying petrol, what is the average price per litre of petrol?

If one number is 50 percent less than X and the other numbers are 20 percent less than X. What is the ratio of both the numbers?

If the compound interest rate is 20%  per year, compounded half-yearly, then what will be the interest of two years on the principal of 1,00,000?

What will be the area of the curved surface of an elliptical cylinder whose height and diameter are 10 cm and 8 cm respectively?