Pls help me for Answer number two A only

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:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

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Asource of laser light sends rays ab and ac toward two opposite walls of a hall. the light rays strike the walls at points b and c, as shown below: what is the distance between the walls?

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Ken earned $128 from his part-time job this summer. he spent 25% of his money on games. he is going to donate 1/6 of the remaining money to charity. how much money will the charity receive?

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