The average (mean) of two numbers is 7 . One of the numbers is 5 . The other number is
(A) 6
(B) 4
(C) 3
(D) 8
(E) 9
Solution 1

Since the average of two numbers is 7 , their sum is $2 \times 7=14$.

Since one of the numbers is 5 , the other is $14-5=9$.

## Solution 2

The average of two numbers is 7 and one of the numbers is 5 .

Since 5 is 2 less than 7 , the other number must be 2 more than 7 , and so is 9 .

ANSWER: (E)