Show complete solutions and write on the blanks provided. Include drawings/figures if needed. All final answers to be boxed. All final answers are in two decimal places 0.00 1. A contractor is to construct a scale model of the three great pyramids of Giza using concrete. The details are as such: the first pyramid has square base with each edge measuring 60 cm and a height of 120 cm, the second pyramid has square base with each edge measuring 80 cm and a height of 140 cm, and the third pyramid has square base with each edge measuring 100 cm and a height of 160 cm. if the three pyramids are to be made of concrete, a) what is the total volume of concrete needed in cubic meters (20 pts); and b) how many bags of concrete are needed if each cubic needs 6 bags of concrete (5 PTS) 2. A Gl pyramidal roof is to be painted with grey primer in preparation to its paint's roof final coating. Given that the base edge is 6.0 meters and the height is 4.5 meters, a) how many cans of primer are needed if each can cover an area of only 0.55 square meters? (10 pts); b) if the base surface area is needed to be applied with primer also, how many cans now in total are needed? (5 pts)