Hi,

Let x represent the constant of proportionality

 3x + 2x = 15

    5x = 15

     x = 3

 3*3 = 9 buses

CHECKING our answer***(3*2 = 6 bicycles)

 9 + 6 = 15

Wish You the Best in your Studies.

 

Answer by LinnW(1048)   (Show Source): You can put this solution on YOUR website!
 With a ratio of 3:2 , 3/(3+2) = 3/5 is the fraction that is buses.

3/5 * 15 = 3*15/5 = 3*3 = 9.

With a ratio of 3:2 , 2/(3+2) = 2/5 is the fraction that is bikes.

32/5 * 15 = 2*15/5 = 2*3 = 6.

We have 9 buses and 6 bikes. 

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