Level 3
4 straws are needed to form 1 square. 7 straws are needed to form 2 squares. 10 straws are needed to form 3 squares. How many straws are needed to form 5 squares?
Level 3
The following tank has a square base of side 40 cm. It is filled with water to a height of 8 cm. If 32 ℓ more of water is needed to fill the tank completely, what is the height of the tank?
Level 3
The following tank has a square base of side 40 cm. It is filled with water to a height of 8 cm. If 32 ℓ more of water is needed to fill the tank completely, what is the height of the tank?