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An ideal gas is subjected to cyclic proc...

An ideal gas is subjected to cyclic process involving four thermodynamic states, the amounts of heat (Q) and work (W) involved in each of these states are
`Q_(1)= 6000 J` ,`Q_(2)= -5500 J,` `Q_(3) = -3000 J,``Q_(4) =3500 J`
`W_(1) = 2500 J, ``W_(2) = -1000 J,``W_(3) =-1200 J:``W_(4) = x J `
The ratio of the net work done by the gas to the total heat absorbed the gas is `eta `. The values of `x` and `eta` respectively are

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