Math 8R - Help!

Sara went to the park and saw that there were a total of 15 bicycles and tricycles. If the total number of wheels was 39, how many tricycles were there?

bi = 2 wheels
tri = 3 wheels

Please help me, I'm really struggling with this problem

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asked by Laruen
  1. I don't remember the easiest way to do this -- so I tried trial and error.

    6 bikes and 9 trikes

  2. 15 x 6 = 30 wheels
    3 x 9 = + 9 wheels
    ________________________
    12 39

    am i correct????


    btw --- what's trial and error???? I don't remember learning this last year.

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    posted by Laruen
  3. I don't understand your arithmetic above. I gave you the answer.

    Trial and error means trying different combinations of numbers until you find the answer.

    6 bikes = 12 wheels
    9 trikes = 27 wheels

  4. Thank You! :)

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    posted by Laruen

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