Parking field

There were nine cars in the parking field. The motorcycles were three times less. How many motorcycles are here and how many wheels are in the parking field?

Correct result:

m =  3
k =  42

Solution:

$$\begin{gathered} a=9 \\ m=a\mathrm{/}3=9\mathrm{/}3=3 \end{gathered}$$

$k=4\cdot a+2\cdot m=4\cdot 9+2\cdot 3=42$

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