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There were X people in a room when a meeting started. Y people left the room during the first hour, while Z people entered the room during the same time. Find the equation that gives the number of people in the room after the first hour as a percentage of the number of people in the room who have been there since the meeting started?

There were X people in a room when a meeting started. Y people left the room during the first hour, while Z people entered the room during the same time. Find the equation that gives the number of people in the room after the first hour as a percentage of the number of people in the room who have been there since the meeting started? Correct Answer 100 x (X - Y + Z)/X

Calculation:

The meeting started with X people. Y left the room during the first hour.

So, X people have been in the room since the meeting started.

This will be the denominator of the equation.

∴ To start with there were P people, Q of whom left the room and another R joined the group.

∴ the number of people in the room after the first hour = X - Y + Z.

This expression is the numerator of the expression.

∴ Required expression is 100 x (X - Y + Z)/X

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