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    An aquarium contains 280 tropical fish of various kinds. If 60 more clownfish were added to the aquarium, the proportion of clownfish would be doubled. How many clownfish are in the aquarium?
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    (Original post by Harrykel)
    An aquarium contains 280 tropical fish of various kinds. If 60 more clownfish were added to the aquarium, the proportion of clownfish would be doubled. How many clownfish are in the aquarium?
    What have you got so far?
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    (Original post by Harrykel)
    An aquarium contains 280 tropical fish of various kinds. If 60 more clownfish were added to the aquarium, the proportion of clownfish would be doubled. How many clownfish are in the aquarium?
    Try representing that information in terms of x.
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    Current proportion: x/280
    After: x+60/340

    2*(x/280) = x+60/340
    x/140 = x+60/340
    Cross multiplly
    340x = 140x + 840
    200x = 8400
    x =42
    So there were originally 42 clownfish, and after adding 60, 102 clownfish
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    (Original post by AcornFalls)
    Current proportion: x/280
    After: x+60/340

    2*(x/280) = x+60/340
    x/140 = x+60/340
    Cross multiplly
    340x = 140x + 840
    200x = 8400
    x =42
    So there were originally 42 clownfish, and after adding 60, 102 clownfish
    complete answers are frowned upon. *
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    (Original post by AcornFalls)
    Current proportion:
    New poster - please note we don't post full solutions.

    Why not use C as the number of clownfish?

    You have not defined x btw ...
 
 
 
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