A thermodynamic system undergoes a process in which its internal energy increases by 480 J. At the same time, 220 J of work is done by the system. Find the energy transferred to or from it by heat?

Question

A  thermodynamic system undergoes a process in which its internal energy increases by 480 J. At the same time, 220 J of work is done by the system. Find the energy transferred to or from it by heat?
I TRIED ADDING 480+220 TO GET 740 but it says it is not the right answer, how close am I plse help?

drwls · Answer

Heat(in)- Work(out) = Change in internal energy Heat in = Work + change in Internal energy You added the right two numbers but should have come up with 700 J