Level 3
Dennis saved some money on the first week. Each following week, he managed to save $8 more than the week before. He saved a total of $100 after 4 weeks. How much money did he save on the 3rd week?
Level 3
The length of a rectangular field is twice as long as its breadth. The perimeter of the rectangular field is 36 m. What is the area of the rectangular field?