SAT Math problem help needed!?

Question

1) The water is in a rectangular tank whose base is 2feet by 6feet. If a rectangular solid whose dimensions are 1 foot by 1foot by 2 feet is totally immersed in the water, how many inches will the water rise?


2) A piece of wire is bent to form a circle of radius 3 feet. How many pieces of wire, each 2 feet long, can be made from the wire?


Help me~~ >_ Please explain in details!!!!♥_♥

Answer 1

1. Since you have to displace 4 cubic feet to have the solid immersed, the water has to rise 4 inches in the 12 ft2 cross-section.

2. If the radius is 3 ft, the circumference is 2*pi*3 or about 18.8 ft. You can cut 9 pieces of wire from this.