with that in mind, we know a rectangle has four sides. with 2 pairs being the same.
The length as told is, 5 centimeters less than two times the width. Two times the width would be 2w and five less than that would be minus five. so the length is 2w - 5
now to find the perimeter we do two times the width + two times the length.
2w + 2(2w -5) = 80. Distribute: 2w + 4w - 10 = 80 Add ten to both sides and combine the 2w & 4w: 6w = 90 Divide both sides by 6: w = 15.
with this we know the width is 15. to find length plug in 15 to the 2w - 5 equation.
2(15) - 5 = 30 - 5 = 25.
Slap on the units and width = 15 cm, length = 25 cm
600 minutes at the gym divided by a total of 60 minutes equals 10. 10 times 25 minutes on the treadmill equals 250 minutes. 10 times 35 minutes lifting weights equals 350 minutes. He’s going to spend 100 more minutes lifting weights than on the treadmill per week.
