Find the average of all prime numbers from 1 to 20?

At each corner of a triangular field of sides 26m, 28m, and 30m, a cow is tethered by a rope of length 7m. the area unglazed by the cow? 

A contractor undertakes to finish a certain work in 124 days and employed 120 men. After 64 days, he found that he had already done 2/3 of the work. How many men can be discharged so that the work may finish in time ?

A person started his journey in the morning.  At 11.a.m he covered of the journey and on the same day at 4.30 p.m. he covered  of the journey. He started his journey at? 

In a mixture of three varieties of pulses, the ratio of their weight is 4 : 5 : 8. If 5 kg of pulses of the first variety, 10 kg of the second variety and some quantity of pulses of the third variety are added to the mixture, the ratio of the weights of three varieties of pulses becomes as 5 : 7 : 9 . In the final mixture, find the quantity of third variety of pulses was?

Tulika got 95% marks in Physics, Chemistry and Maths together and 225 marks in Computer, English and Hindi. If maximum marks in each subject is 100, what is the total percentage marks obtained by Tulika in all the six subjects together?

Raju started business investing Rs. 75000. After 4 months Sanju joined the business with Rs. 112500. If at the end of the year total profit was Rs.4500, find Sanju’s share?

A rectangular plot is 32m by 24m. The owner of that plot wants to divide the plot into equal parts and for that purpose he builds a fence of wire on one diagonal. If wire costs Rs. 15.50 per metre, how much amount will be spent on fencing?