The average of 3 numbers is 7 and
average of first two numbers is 4.
What is the third number?
(1) 15 (2) 13 (3) 7 (4) 4
Answers
Answered by
1
Answer:
Step-by-step explanation:
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Answered by
2
Answer:
13
Step-by-step explanation:
average =7
x+y+z/3=7
x+y+z=21. eqn 1
x+y/2=4
x+y=8
put in eqn 1
8+z=21
z=13
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