60 lbs can be divided into three groups, in this case the bags of sand, so 60 divided by 3 is 20.
Now you have the 8 lbs left. It gets divided into two groups/bags so you would do 8 divided by 2 is 4.
Then for your ratio it is cement to sand which is 4:20. You can write the ratio however way you want or what is required by the question.(fraction bar, ‘to’, or colon ‘:’ )
21/7=3mins per wall with 5 people. Because we assume that all of the people paint at the same rate, 3 X 5=15 mins for one person working alone. 15/3=5 mins per wall with 3 people X 10 people= 50 mins for 3 people to paint 10 walls.
Total cost = 1.50 per bottle y = 1.50x If x = 1, y = $ 1.50 (1,1.5) If x = 2, y = $ 3.00 (2,3) If x = 3, y = $ 4.50 (3, 4.5) If x = 4, y = $ 6.00 (4, 6) There are your 4 sets of ordered pairs to graph. You could continue with more x-values to get more ordered pairs.