Let total work be 24 units = LCM of (8 and 12)Efficiency of ‘A’ = 24/8 = 3 units/dayEfficiency of ‘B’ = 24/12 = 2 units/dayTotal work done by ‘A’ in 4 days = 4 × 3 = 12 unitsTime taken by ‘B’ to build rest of the wall = {(24 – 12)/2} = 6 daysTotal time taken = 6 + 4 = 10 days
A football player scored 400 points in the first eight games of the season. Find the average points he must score in the next two games so that his aver...
The average weight of a group of five persons, A, B, C, D, and E is 62 kg. If another person K joins the group then the average weight of the group is d...
The average age of three children is 25 years. If their ages are in the ratio 2:6:7. Find the age of the youngest child.
There are three distinct numbers ‘a’, ‘b’ and ‘c’. If, a = 150, (a + b) = 450 and (c – b) = 60, then find the average of a, b and c.
...The average weight of 20 boys is 48 kg. However, the weights of three boys, originally 46 kg, 44 kg, and 38 kg, were incorrectly ...
The average age of 26 children and their teacher's age are 22 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
The average score obtained by 28 students in a class test is 68 marks. The top place was shared by 3 people who got the same score. If the lowest score ...
The average cost price of 12 pens (having equal cost price) decreased by Rs.2, when one of the pen is replaced by a new pen having cost price of Rs.80. ...
The average expenditure of a man for the first five month is Rs.14000 and for the next seven months is Rs.12000. If he saves 17000 in that year then fin...
