On a scale drawing, a rectangle 1 inch by 1~$\frac{1}{3}$~ inches represents the floor of a room and the indicated scale is 1 inch equals 15 feet. How many square tiles 6 inches on a side will be needed to cover this floor? (1 foot= 12 inches)
40
70
120
700
1200
floor的面积是1inch*4/3inch,1inch=15feet。所以这个面积是15*20=300feet^2
然后一个6*6inch的正方形瓷砖要铺满,这时候他说1foot等于12inchs。一块瓷砖的面积就应该是0.5foot*0.5foot等于0.25feet^2
所以需要300/0.25=1200块瓷砖
这题是算要多少小方块能平铺,on a side有点奇怪不知道放这里什么意思