Speed of stream = 20 × (80/100) = 16 km/hr Time taken to go 72 km = 72/(20 + 16) = 2 hrs
In an examination the average marks of Rohit is 55. If he got 15 more marks in science and 27 more marks in maths then his average would have been 61. F...
Average run scored by a batsman in 18 innings is 60. In next 6 innings, he scored runs with an average of ‘x’ so that his overall average increases ...
The average wage of a group of 20 labourers is Rs. 500. If 4 persons receiving average wage of Rs. 360 leave the group and 2 persons receiving average w...
If the average of 38, 49, 42, and 'b' is 50, then find the value of '2b'.
In a school with 400 students, the average age of the boys is 16 years and that of the girls is 12 years. If the average age of school is 14 years 9 m...
The average weight of 25 employees in an office increases by 0.8 kg when the weight of the manager is included. If earlier the average weight of the emp...
The average age of a group of seven children is 10 years. From the group, two children, whose ages were 5 years more and 3 years more than the average a...
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 age of a class of 24 girls is 16 years. If 6 new girls having average age of 12 years join the class, then the average age of the class beco...
The average score of a class of boys and girls in examination is X. The ratio of boys and girls in the class is 4:3. If the average score of the boys (X...
