Question
A fluid flows through a horizontal pipe. The pressure
drops by 2000 Pa and speed increases from 2 m/s to 4 m/s. Find density.Solution
From Bernoulli's theorem: 
The average of 18 numbers is 40, and the average of the first 9 numbers is 45. Find the average of the remaining 9 numbers.
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The average age of 32 children and their teacher's age are 28 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
A bowler gives 15.2 runs per wicket. He gives 32 runs and takes 4 wickets in the last match after which his average becomes 14.4 runs per wicket. How ma...
