GMAT Quantitative Reasoning - DSQ: Calculating ratio and proportion

1

At Branchwood Middle School, there are 4 sixth graders for every 5 seventh graders and 6 seventh graders for every 5 eighth graders. How many sixth graders are there?

1. The ratio of sixth graders to eighth graders is 24:25

2. There are 75 eighth graders at the middle school.

2

Fred is looking at a map and is wondering how far it is from Washington City to Bush Corner. He sees that on the map, they are three and a half inches apart. From the map distance between the two, how far is it in actual miles?

Statement 1: The distance from Adamsville to Clinton Ridge on the map is four and a half inches.

Statement 2: In actuality, it is 85 miles from Adamsville to Clinton Ridge.

3

In a car dealership there are SUVs to every sedans, and sedans to every sports car. How many sedans are there?

There are SUVs.
There are sport cars.

4

Last year, a computer shop had an average of 75 computers in stock at the start of each day, and it sold an average of 300 computers each week.

This year, the shop is expecting to sell an average of 732 computers each week. The computer store wants to use last year's ratio of computers in stock to computers sold to decide how many computers to have in stock each day. What should this target number be?

5

Eleanor has a a scale model of the Voyager I probe. What is the radius of the dish in the model?

I) The length of the antennae on the model is $\frac{1}{60}$ the length of the actual antennae.

II) The radius of the dish on the actual probe is feet.

DSQ: Calculating ratio and proportion

Practice Questions