1. Find value of `x` where Harmonic mean`=24` for data `x,30`

Solution:
HM `=2/(1/x+1/30)`

`24=2/(1/x+1/30)`

`1/x+1/30=2/24`

After solving, we get
`x=20`

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2. Find value of `x` where Harmonic mean`=48` for data `40,x`

Solution:
HM `=2/(1/40+1/x)`

`48=2/(1/40+1/x)`

`1/40+1/x=2/48`

After solving, we get
`x=60`

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3. Find value of `x` where Harmonic mean`=3.4286` for data `2,x,8`

Solution:
HM `=3/(1/2+1/x+1/8)`

`3.4286=3/(1/2+1/x+1/8)`

`1/2+1/x+1/8=3/3.4286`

After solving, we get
`x=4.0001`

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4. Find value of `x` where Harmonic mean`=3.1169` for data `2,x,4,5`

Solution:
HM `=4/(1/2+1/x+1/4+1/5)`

`3.1169=4/(1/2+1/x+1/4+1/5)`

`1/2+1/x+1/4+1/5=4/3.1169`

After solving, we get
`x=3.0001`

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5. Find value of `x` where Harmonic mean`=3.4483` for data `x,3,4,5,6`

Solution:
HM `=5/(1/x+1/3+1/4+1/5+1/6)`

`3.4483=5/(1/x+1/3+1/4+1/5+1/6)`

`1/x+1/3+1/4+1/5+1/6=5/3.4483`

After solving, we get
`x=2`

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