Bikes and Trikes.

Question

I need your help do this soon bc its due sooner. So any equations? 

Frazer went to a bicycle show. At the show, there were some trikes (With 3 wheels) and bikes (with 2 wheels). She counted 25 wheels altogether. How many bikes and how many trikes were there? There is four different answers.

Answer 1

B=bike, T=trike, 2B+3T=25.

B=(25-3T)/2=(24-2T)/2+(1-T)/2=12-T+(1-T)/2.

When T is odd the numerator will be divisible by 2.

So we start with T=1, then 3, 5, ...

T  B

1   11

3    8

5    5

7    2