An ideal gas is taken through the cycle $A \to B \to C \to A$ , as shown in the figure. If the net heat supplied to the gas in the cycle is $5\ J$, the work done by the gas in the process $C \to A$ is  .... $J$
  • A$-5$
  • B$-10$
  • C$-15$
  • D$-20$
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