The average of two numbers is XY. If one number is X, the other is
Y/2
Y
2XY  X
X (Y  1)
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1
Discuss

Five years ago, the average age of P and Q was 25. The average age of P, Q and R today is 25. Age of R after 5 years will be :
Solution 
2
Discuss

The average wages of a worker during a fortnight comprising 15 consecutive working days was Rs. 90 per day. During the first 7 days, his average wages was Rs. 87/day and the average wages during the last 7 days was Rs. 92/day. What was his wage on the 8th day?
Solution 
3
Discuss

The average weight of 3 men, A, B and C is 84 kg. Another man D joins the group and the average now becomes 80 kg. If another man E whose weight is 3 kg more than that of D, replaces A then the average weight of B, C, D and E becomes 79 kg. What is the weight of A ?
Solution 
4
Discuss

A batsman makes a score of 270 runs in the 87th inning and thus increase his average by a certain number of runs that is a whole number. Find the possible values of the new average.
Solution 
5
Discuss

Find the average of all prime numbers between 30 and 50.
Solution 
6
Discuss

There are five boxes in cargo hold. The weight of the first box is 200 kg and the weight of the second box is 20% higher than the weight of the third box, whose weight is 25% higher than the first box's weight. The fourth box at 350 kg is 30% lighter than the fifth box. Find the difference in the average weight of the four heaviest boxes and the four lightest boxes.
Solution 
7
Discuss

If 25a + 25b = 115, what is the average of a and b?
Solution 
8
Discuss

There were 35 students in a hostel. Due to the admission of 7 new student, the expenses of the mess were increased by Rs. 42 per day, while the average expenditure per head diminished by Re 1. What was the original expenditure of the mess?
Solution 
9
Discuss

If the average of x and 1/x(X\( \ne \)0) is M, then the average of x2 and 1/x^{2} is :
Solution 
10
Discuss

The average age of A, B, C, D and E is 40 years. The average age of A and B is 35 years and the average of C and D is 42 years. Age of E is :
Solution 
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