17. If a + 2b = 14 and 5a + 4b = 16,
what is the average (arithmetic
mean) of a and b?
Answers
Answered by
3
Step-by-step explanation:
a+2b=14. (1)
5a+4b=16. (2)
a=14-2b put this value in equation (2),
5(14-2b)+4b=16
70-10b+4b=16
-6b=16-70
-6b= -54
b=54/6
b=9
put value of b in equation (1),
a+2(9)=14
a=14-18
a= -4
hence a= -4 and. b= 9
mean=(a+b)/2
=(-4+9)/2
=5/2
Answered by
0
Answer:
Average (arithmetic mean) of a and b is 2.5.
Step-by-step explanation:
Putting the equation (iii) in (ii), we get
Putting value of b in equation (i)
a = -4
b = 9
Average of a and b
Average (arithmetic mean) of a and b is 2.5.
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