Source: Official Guide for the GMAT 13th Ed. Problem Solving; #188 Official Guide for the GMAT 2015 14th Ed. Problem Solving; #188

1

Last year, for every 100 million vehicles

Last year, for every 100 million vehicles that traveled on a certain highway, 96 vehicles were involved in accidents. If 3 billion vehicles traveled on the highway last year, how many of those vehicles were involved in accidents? (1 billion=1,000,000,000)

3 Explanations

1

Cameron Layer

96 accidents per 100 million = 960 accidents per billion.
Multiply 960 by 3 to get 2880 per 3 billion. (you don't even have to do the multiplication, as you know it will be just short of 3000 and answer C is the only answer just short of 3000.)

Aug 24, 2020 • Comment

Adam Lyons, Magoosh Tutor

That's exactly right! Well done, and thanks for sharing a great solution! :)

Aug 30, 2020 • Reply

1

Daniel Suh

Sharing another approach to solve this problem.

Step 1) 100 Million/96 Accidents = 3000 Million/x
Step 2) Simplify 100 Million and 3000 Million which will give us

1/96 = 30/x

Step 3) Cross multiply and solve for x.

x=2880

Dec 21, 2015 • Comment

Cydney Seigerman, Magoosh Tutor

Great job! Thanks for sharing your approach :)

Dec 21, 2015 • Reply

2

Gravatar Mike McGarry, Magoosh Tutor

Dec 28, 2013 • Comment

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