Answer:
\[dQ=dU+dW\]
or
\[dU=dQdW\]
\[{{W}_{1}}={{W}_{2}}+100\]
Since
\[dU\] is same in both the cases.
\[\therefore
\] \[Q\,=1000\,\,J-100\,\,J=900\,J.\]
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