The average age of a class of 40 students and a teacher reduces by 0.5 years, if we exclude the teacher. If the initial average age is 18 years, then what is the age of the teacher?

The average weight of Shivam, Rupesh and Mandar is 45 kg. If the average weight of Shivam and Rupesh is 38 kg and the average weight of Rupesh and Mandar is 50 kg, then find Rupesh's weight (in kg).

A grocer has a sale of Rs.6635, Rs.7127, Rs.7055, Rs.7430 and Rs.6462 for 5 consecutive months. How much sale must he have in the sixth month so that he gets an average sale of Rs.6700? (In Rs.)

In a class, the number of boys is 40% more than that of girls. In an examination, the average marks obtained by boys is 20% less than the average marks obtained by girls. If the average marks obtained by all the boys and girls is 53, then what is the average marks obtained by the boys ?

The average weight of the girls in a group is 58 kg. When 5 girls of average weight 60 kg leave the group or 5 girls of average weight 55.5 kg join the group, the average weight of girls in both cases is equal. What is the number of girls, initially, in the group?

The average of first 148 odd natural numbers, is:

The weight of five tables in a shop are 9.8 kg, 12.42 kg, 25.38 kg, 4.426 kg and 32.388 kg. Shop keeper got one more table and now total weight is 100 kg. The weight of new table is

The average weight of Mohammad, Ashish and Kiran is 46 kg. Average of Mohammad and Ashish is 40 kg and that of Ashish and Kiran is 42 kg. What is the weight of Ashish(in Kg).