From a class of girls and boys the probability that one student chosen at random to answer a question will be a girl is 1/3 . If four boys leave the class , the probability that a student chosen at random to answer a question will be a girl is 2/5 . How many boys and girls are there in the class before the four boys leave ?

Answers

Answer 1

Answer: let the no. of girls be x and boys be y......
x/y=1/3
=>3x=y ...............(I)
now 4 boys leave the class is then
x/y-4=2/5
=>5x=2y-8
(I)=>5x=2(3x)-8
x=8
now 3x=y
=>y=24
therefore no. of girls is 8 and the no. of boy is 24..............
I have tried my best.....hope i helped............

Answer 2

Answer:

Step-by-step explanation:

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Answers

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Answers

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Can you plz help me on this?

Answers

Answer:

B 2x-31 = -2x-31

Step-by-step explanation:

A is exactly the same on the left side as the right so it has infinite solutions

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Answer:

Step-by-step explanation:

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Answers

16 people is the answer :) Hope this helps, and a rate and thanks would be nice ;D

I took 400 - 150 divided by 15 and got 16. So believe that should could afford to bring 16 people.

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Answers

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Answers

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