A gas can be taken from $\mathrm{A}$ to $\mathrm{B}$ via two different processes $\mathrm{ACB}$ and $\mathrm{ADB}$.



When path $\mathrm{ACB}$ is used $60 \mathrm{J}$ of heat flows into the system and $30 \mathrm{J}$ of work is done by the system. If the path $\mathrm{ADB}$ is used then work done by the system is $10\mathrm{ }\mathrm{J}$, the heat flows into the system in the path $\mathrm{ADB}$ is: