Hi I need answers for pre cal

29. The length and breadth of the floor of a room are 30 feet and 20 feet , respectively. Square tiles of 2 feet length of different colours are to be laid on the floor. Black tiles are laid in the first row on all sides. If white tiles are laid in one- fourth of the remaining area and blue tiles in the rest, how many blue tiles will be there? A. 104 B. 312 C. 78 D. 416 30. A solid in the form of a cube of edge 12 cm is melted and formed into three smaller cubes of different sizes. If the edges of two smaller cubes are 6 cm and 8 cm, then find the edge of the third smaller cube. A. 16 cm B. 12 cm C. 14 cm D. 10 cm 31. In a swimming pool measuring 90 m by 40 m. 150 men take a dip. If the average displacement of water by a man is 8 cubic metres, what will be the rise in water level? A. 25 cm B. 30 cm C. 20 cm D. 33.33 cm 32. Consider a right pyramid whose base is an equilateral triangle of side 4 cm each. Each slant edge is 5 cm long. What will be the volume of the pyramid? A 4V61 3 -cm3 B. 4v59 C. 471 3 .cm3 3 cm3 33. An ice cream cone is filled with ice cream and surmounted ice cream in the form of a hemisphere on top of the cone. If the hemispherical surface is equal to the lateral area of the cone, find the total volume (in cubic inches) of ice cream if the radius of the hemisphere is 1 inch and assuming the diameter of hemisphere is equal to the diameter of the cone. A. 3.91 B. 3.45 C. 4.12 D. 4.25