ratio and percentages in algebra *help* URGENT

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kittymityyy
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m:n = 3:8 and r is 20% of n. Work out m:r.
How would you work this out? please help.
Last edited by kittymityyy; 1 month ago
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cflau_
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r=0.2n
\dfrac{m}{r}=\dfrac{m}{0.2n} = \dfrac{5m}{n} =\dfrac{15}{8}
Last edited by cflau_; 1 month ago
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kittymityyy
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(Original post by cflau_)
r=0.2n
\dfrac{m}{r}=\dfrac{m}{0.2n} = \dfrac{5m}{n} =\dfrac{15}{8}
thank you for your reply!
but i don't understand where you get 5m from? is it 8-3? but what are you working out when subtracting these values?
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ApplePi55
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(Original post by kittymityyy)
thank you for your reply!
but i don't understand where you get 5m from? is it 8-3? but what are you working out when subtracting these values?
It’s to get rid of the decimal of *0.2n* you times it by 5 so it just becomes n and the top is 5m
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kittymityyy
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(Original post by ApplePi55)
It’s to get rid of the decimal of *0.2n* you times it by 5 so it just becomes n and the top is 5m
thank you so much! life saver!
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