the harmonic mean between x and 9/2 is 18/5, find x.
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if two numbers a and b given
then HM of these two numbers
is---
HM=2ab/(a+b)
now,
x and 9/2 are given
18/5=2x.9/2/(x+9/2)
18/5=18x/(2x+9)
1/5=x/(2x+9)
2x+9=5x
3x=9
x=3
then HM of these two numbers
is---
HM=2ab/(a+b)
now,
x and 9/2 are given
18/5=2x.9/2/(x+9/2)
18/5=18x/(2x+9)
1/5=x/(2x+9)
2x+9=5x
3x=9
x=3
abhi178:
thanks sir
:)
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