The mean o 1², 2², 3², 4², 5², 6², 7² is:

Jagtap purchases 30 kg of wheat at the rate of 11.50 per kg and 20 kg of wheat at the rate of 14.25 per kg.  He mixed the two and sold the mixture. Approximately at what price per kg should he sell the mixture to make 30 percent profit?

(25.01)² -(15.99)²=?

A shopkeeper purchased 415 kg. of price at Rs. 25 per kg. He sold 225 kg. of rice at Rs. 28 per kg. At what approximately price per kg. should he sell the remaining rice in order to gain 20%?

A vessel has 20 litres of a solution of milk and water,having 90 per cent milk. How many litres of solution must be withdrawn from the vessel and replaced with water so that the vessel would have 80 per cent milk?

A camp has provisions to last for 6 days for 224 cadets. How many cadets must be sent away for the provisions to last for 7 days?

One litre of water was mixed to 3 litres of sugar solutions containing 4% of sugar. What is the percentage of sugar in the solution?

How is my father’s wife’s grandfather’s only child’s sons is related to me?

The cost of 16 packets of salt, each weighing 900 grams is Rs. 28. What will be the cost of 27 packets, if each packet weighs 1kg?

In how many different ways can the letters of word ‘BIOLOGY’ be arranged?