NEED HELP ASAP

As shown below, a gas goes through the cycle ABCA during which $17\mathrm{.}5$ J of heat was added to lt $.$ During the process $AB,142\mathrm{.}7J$ of heat was added to the gas. During the process $BC,27\mathrm{.}5J$ of heat was removed from the gas. Determine $W_{AB}$&$U_{CA}.$

$w_{AB}=$

$U_{CA}=$