Answer :
2(l+w)=P
72 x 2= 144
240 - 144= 96
96/2= 48
your answer would be 48in.
check
2(72+48)= 240
144+96= 240
240=240
72 x 2= 144
240 - 144= 96
96/2= 48
your answer would be 48in.
check
2(72+48)= 240
144+96= 240
240=240