Question

Some vinyl records (let's call them "Oldies") rotate at the rate of 78 rpm (revolutions per minute).

The chart below shows revolutions per minute for three different tracks on another type of vinyl record (called "Goodies").

Which has a greater rate of revolutions per minute, Oldies or Goodies?

Track 1 Track 2 Track 3

Minutes 3 4 5

Revolutions 135 180 225

Choose 1 answer:

Choose 1 answer:


(Choice A)

A

Oldies


(Choice B)

B

Goodies


(Choice C)

C

the rates are the same

Answer 1

(A ) Oldies

Explanation:

Goodies

First, we determine the revolution rate per minute of the Goodies.

Revolution rate per minute
`=$Number of Revolutions / $Number of Minutes`

`=(135)/(3) =(180)/(4) =(225)/(5)=45$ revolutions per minute`

Since the oldies have a rate of 78 revolutions per minute;

78 rpm. >45 rpm.

We therefore conclude that the Oldies has a greater rate of revolutions per minute.

The correct option is A.