GreenlightTestPrep wrote:

A satellite is composed of 30 modular units, each of which is equipped with a set of sensors, some of which have been upgraded. Each unit contains the same number of non-upgraded sensors. If the number of non-upgraded sensors on one unit is 1/5 the total number of upgraded sensors on the entire satellite, what fraction of the sensors on the satellite have been upgraded?

A)5/6

B)1/5

C)1/6

D)1/7

E)1/2

Since we're asked to find a certain FRACTION, we can

plug in some nice values that meet the given conditions.

Let's say that there's a TOTAL of

5 upgraded sensors on the entire satellite

the number of non-upgraded sensors on one modular unit is 1/5 the TOTAL number of upgraded sensors on the entire satelliteSo, the number of non-upgraded sensors on

EACH modular unit = (1/5)(

5) =

1.

Since there are 30 modular units altogether, the TOTAL number of non-upgraded sensors = (30)(

1) =

30.

So, the TOTAL number of sensors = (number of non-upgrades) + (number of upgraded)

=

30 +

5 =

35What fraction of the sensors on the satellite have been upgraded?=

5/

35= 1/7

Answer:

Cheers,

Brent

_________________

Brent Hanneson – Creator of greenlighttestprep.com

Sign up for my free GRE Question of the Day emails