The average of three number is 9 if the average of first two number is 12 find the third number
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Answered by
11
given 9 is the average of 3 number
12 is the average of 2 numbers
then x+y/2=12
x+y=24
x+y+z/3=9
24+z=27
z=3
12 is the average of 2 numbers
then x+y/2=12
x+y=24
x+y+z/3=9
24+z=27
z=3
Answered by
3
Answer: 21
Step-by-step explanation:
simple
(108*2)+ (12*3)= 252
AVG of 252 is (252/12)= 21
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