l=3w+5 2(3w+5)+2w=250 (both w and l have to be multiplied by two because there are two sides) This can be simplified to: 6w+10+2w=250 Now subtract 10 from both sides and add the two w's together. This makes: 8w=260 Divide both by 8: 32.5-w=32.5 32.5 times 2=65 250-65=185, divided by 2=92.5