Rein's rate problem

http://www.livestrong.com/article/490366-how-to-eliminate-gas-and-bloating-with-apples-and-milk/ 





Group Problem
    rate to unit rate
    If there's 6 girls per 2 boys, how many girl if there's only 1 boy?



My Problem
    rate to unit rate
    There are $0.25 per 100 ml of milk, how many cents there are in ml of milk?



My problem
   unit rate to rate
   If there's 20 apples per milk, how many apples there are in 50 pieces of milk?



Group Problem
   unit rate to rate
   If there's 2 paper per pencil, how many paper are there if there's 10 pencils?

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