if the ratio of girls to boys in a classroom is 4:5 and there are 20 boys find the number of the girls

Question

anonymous · Answer

a.12   B.25   C.16     D.8

ivettef365 · Answer

For every 4 girls there are 5 boys, so if there are 20 boys 4x5 = 20 and 4x4 = 16

anonymous · Answer

if it says the ratio is girls to boys, that means it is girls:boys, so 4:5 means that for every 4 girls, there are 5 boys. so set it up like a fraction...
$$\frac{ 4 }{ 5} = \frac{ x }{ 20 }$$
then you can cross multiply, so you have $$5x = 80$$
And then you can divide both sides by 5 to get x by itself, so that
$$x = 16$$

anonymous · Answer

so your answer is C, obviously :)

anonymous · Answer

thank you guys very much  because of you im getting the hell out of highschool :D

anonymous · Answer

i got another question can you help?

anonymous · Answer

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