SAT Mathematics Practice Test 2

Question : 22 of 58

Marks: +1, -0

A quality control manager at a factory selects7 lightbulbs at random for inspection out of every400 lightbulbs produced. At this rate, how manylightbulbs will be inspected if the factory produces20,000 lightbulbs?

Validate

Solution:

The quality control manager selects

7

lightbulbs at random for inspection out of every 400 lightbulbs produced. A quantity of

20,000

lightbulbs is equal to

{20,000}/400=50

batches of 400 lightbulbs. Therefore, at the rate of 7 lightbulbs per 400 lightbulbs produced, the quality control manager will inspect a total of

50×7=350

lightbulbs.
Choices A, C, and D are incorrect and may result from calculation errors or misunderstanding of the proportional relationship.

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