Question

a semitruck has 18 wheels. the semitruck has 3 times as many wheels as a garbage truck. how many wheels does the garbage truck have? let ( w ) stand for the number of wheels the garbage truck has. which bar model represents the problem? garbage truck ( w ); semitruck ( w ) ( w ) ( w ); 18. garbage truck 18; semitruck 18 18 18; ( w ). garbage truck ( w ); semitruck ( w ) ( w ); 18. garbage truck 18; semitruck 18 18; ( w ).

Explanation:

Step1: Analyze the relationship

The semitruck has 3 times as many wheels as the garbage truck. Let \( w \) be the number of wheels of the garbage truck, so the semitruck has \( 3w \) wheels, and we know the semitruck has 18 wheels.

Step2: Match with bar models

• First model: Garbage truck is \( w \), semitruck is \( 3w \) (three \( w \) blocks) and total for semitruck is 18. This matches \( 3w = 18 \).
• Second model: Semitruck is \( 3\times18 \), which is wrong.
• Third model: Semitruck is \( 2w \), wrong.
• Fourth model: Semitruck is \( 2\times18 \), wrong.

Answer:

The first bar model (Garbage Truck: \( w \), Semitruck: \( w\ w\ w \) with total 18)