Jawaban:

The parts' ratio indicates that for every 3 car parts, there are 2 motorcycle parts and 3 bicycle parts. Therefore, the ratio of car parts to bicycle parts is 3:3.

Since there are 9 bicycle parts, there must be 9 car parts as well.

The total number of car and bicycle parts is 9 + 9 = 18.

Since the parts' ratio also indicates that for every 4 motorcycle parts, there are 3 bicycle parts, there must be 4 * 3 = 12 motorcycle parts.

The total number of car, motorcycle, and bicycle parts is 18 + 12 = 30.

There are 100 parts in the garage, and 30 of them are car, motorcycle, and bicycle parts, so there are 100 - 30 = 70 parts left for a pickup truck's part. Answer: \boxed{70}.

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