Felicia collects $1 for every car and $2 for every truck passes through the toll gate. if she collects $550, and 200 cars came through the gate, how many trucks came through the gate?

The money she made with 200 cars is:

The money she made with the trucks:

The number of trucks came through the gate:

So there were 175 trucks came through the gate.

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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