Let the distance be x km. Speed upstream = 2 – 1 = 1 kmph Speed downstream = 2 + 1 = 3 kmph => (x/3) + (x/1) = 4 => (x + 3x)/3 = 4 => 4x = 12 => x = 3 km
The average age of A and B is 18 years. If A is to be replaced by C, the average would be 17 years. The average age of C and A is 19 years. Find the age...
The batting average for 40 innings of a cricket player is 50 runs. His highest score exceeds his lowest score by 172 runs, If these two innings are excl...
A person purchased diesel at Rs. 7, Rs. 10 and Rs. 12 per litre in three successive years. If he spent Rs. 2520 each year on diesel, then find the appro...
In a classroom, the average score of 15 students on a test is 44 points. If 5 new students, each with an average score of 'x' points, join the class, an...
The average of 4, 6, 8, 12 and x is 7 and the average of x, 9, 13, 15 and y is 9. What is the value of 2x – 3y?
The average weight of 5 students in a class is 25.8kg. When a new student joins them, the average weight increases by 3.9kg. Then what will be the appro...
Daksh bought 21 notebooks for Rs.1260 from shop A and 14 notebooks for Rs.1190 from shop B. What is the average price he paid per book?
The average of 13 numbers is 10.The average of first 6 numbers is 8 and that of the last 6 numbers is 10. What will be the 13th number?
If the average of s number is r⁴ and the average r number is s⁴, then find the average of all r+ s numbers
In a school with 400 students, the average of the age of the boys is 16 years and that of the girls is 12 years. If the average age of the school is 14 ...
