Question

99 boys and I girl are in a lecture
theatre. How many boys must
leave the theatre so that the
percentage of boys becomes 98%?​

Answer 1

However, to have 98% of girls in the room, you need to use the following formula:

 

x / (x+1) = .98, where x = the number of girls in the room.

 

x = .98 (x+1) (multiply both sides by x+1).

 

x = .98x + .98 (expand)

 

100x = 98x + 98 (multiply both sides by 100)

 

100x - 98x = 98 (subtract 98x from both sides)

 

2x = 98, or x = 49

 

So, you need to have 49 girls left in the room; therefore, 50 girls need to leave the room to bring the percentage of girls down to 98%. Amazing, isn't it?

Answer 2

Answer:

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Step-by-step explanation:

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