On a ferry, there are 50 cars and 10 trucks. The cars have an average mass of 1200 kg and the trucks have an average

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Gmat_mission: Legendary Member; Posts: 1622; Joined: Thu Mar 01, 2018 7:22 amFollowed by: 2 members

by Gmat_mission » Sun Apr 26, 2020 12:03 pm

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On a ferry, there are 50 cars and 10 trucks. The cars have an average mass of 1200 kg and the trucks have an average mass of 3000 kg. What is the average mass of all 60 vehicles on the ferry?

A. 1200 kg
B. 1500 kg
C. 1800 kg
D. 2100 kg
E. 2400 kg

[spoiler]OA=B[/spoiler]

Source: Magoosh

Source: Beat The GMAT — Problem Solving | Sun Apr 26, 2020 12:03 pm

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Re: On a ferry, there are 50 cars and 10 trucks. The cars have an average mass of 1200 kg and the trucks have an average

by Scott@TargetTestPrep » Sun May 03, 2020 5:26 am

Gmat_mission wrote: ↑
Sun Apr 26, 2020 12:03 pm
On a ferry, there are 50 cars and 10 trucks. The cars have an average mass of 1200 kg and the trucks have an average mass of 3000 kg. What is the average mass of all 60 vehicles on the ferry?

A. 1200 kg
B. 1500 kg
C. 1800 kg
D. 2100 kg
E. 2400 kg

[spoiler]OA=B[/spoiler]

Source: Magoosh

We calculate the weighted average to determine the average mass of all 60 vehicles on the ferry:

(50 x 1200 + 10 x 3000) / 60 = 50 x 20 + 10 x 50 = 1000 + 500 = 1500 kg

Answer: B

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