GMAT Quantitative Reasoning Practice Test 3

Question : 42 of 100

Marks: +1, -0

The average (arithmetic mean) of four numbers is equal to three times the largest number. If the largest number is equal to 3 , what is the sum of the other three numbers?

Validate

Solution:

Let's say the four numbers are:

X, Y, Z

and

W

.
The average of all four numbers is equal to 3 times the value of the largest number.

(X+Y+Z+W) \/ 4=3 W \;\text ". "\;

W

is equal to 3 and therefore

(X+Y+Z+3)=3 × 9

X+Y+Z=36-3=33

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