Foot in bus

It was 102 people on the bus. 28 girls had two dogs. A 11 girls had one dog.
At the next stop seceded 5 dogs (even with their owners). They got two boys together with three dogs. The bus drove one driver.
How many foot were in bus?

Correct result:

n =  458

Solution:

$$\begin{gathered} a=102-5+2=99 \\ d=28\cdot 2+11\cdot 1-5+3=65 \\ n=2\cdot a+4\cdot d=2\cdot 99+4\cdot 65=458 \end{gathered}$$

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