The ratio for Friday to Saturday is 1 to 8. There were 7 total cars on Friday, and 56 on Saturday. 7 x 8 = 56, so that is how you get that ratio. Multiply 3 x 8 to fill in the blank for how many hybrid cars there were on Saturday. (24)
For Sunday, we know the three hybrid cars Friday Friday, and 27 hybrid cars from Sunday. 3×9 is 27, so you have to multiply the total number of cars from Friday, 7 x 9 to get the total number of cars for Sunday. (63)
