Question
A man running with the speed of 72 km/hr covers a
certain distance in ‘x’ hours. If the same distance can be travelled with a speed of 80 km/h in (x - 2) hours, then find the value of ‘x’.Solution
According to question, 72x = 80(x - 2) 80x – 72x = 160 8x = 160 x = 20
The average age of a group of 8 friends is 30 years. If one of them leaves, the average becomes 29. Find the age of the friend who left.
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The average age of three children is 32 years. If their ages are in the ratio 3:6:7. Find the age of the youngest child.
Each question contains a statement followed by Quantity I and II. Read the information clearly and answer your questions accordingly.
Quanti...
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Average marks scored by Vineet in five subjects are 72. The average marks scored by him (excluding his highest and lowest marks) are 56 and lowest marks...
The average weight of 7 boxes P, Q, R, S, T, U and V is 72kg. Another box A is added to group and the average now becomes 70kg. If another box C whose ...
The average age of a class of 20 girls is 14 years. If 5 new girls having average age of 9 years join the class, then the average age of the class becomes:
What is the average of the squares of the first 41 natural numbers?
