Question 1203904
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The Sport Shop in town sells bicycles and tricycles.
While looking around, Alyson counted 133 wheels and 45 total cycles.
How many tricycles are in the store?
While you may find the number of bicycles, do not include that in your answer. 

I know the answer is 43 but how?

Let number of tricycles be T
Then number of bicycles = 45 - T
Number of wheels on bicycles and tricycles are 2 and 3, respectively
With total number of wheels being 133, we get: 3T + 2(45 - T) = 133
                                                 3T + 90 - 2T = 133
                                                      3T - 2T = 133 - 90
                                <font color = red><font size = 4><b>Number of tricycles</font></font></b>, or T = <font color = red><font size = 4><b>43</font></font></b></pre>