The average of 8 readings is 24.3, out of which the average of first two is 18.5 and that of next three is 21.2. If the sixth reading is 3 less than seventh and 8 less than eight, what is the sixth reading? 

The price of JK magazine is ₹ 90. There is a 30 % discount on becoming a customer of 45 magazines. While another discount of 25 % is also given to the customer of 26 magazines. Find the difference of the price of a magazine for a customer of 45 magazines and a customer of 26 magazines. 

A and B together can plough a field in 10 hours but by himself A requires 15 hours. How long would B take to plough the same field?

Directions : What should come in place of the question mark (?) in the following number series? 

7 17 54 ? 1098 6591 

The following pie-chart shows the study-time of different subject of a student in a day. Study the pie chart and answer the following questions.If the student studies 10 hours in a day, then he/she studies mathematic for