Question 110856
If 300 jellybeans cost you x dollars. How many jellybeans can you purchase for 50 cents at the same rate? 
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x dollars buys 300 jellybeans
Convert to "cents"

(100 cents)x  buys 300 jellybeans
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Divide both sides by 100x to get:

1 cent buys 300/100x jellybeans = 3/x jellybeans
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Multiply both sides by 50 to get:

50 cents buys 50(3/x) = 150/x jellybeans
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Cheers,
Stan H.