Larry used a pattern of colors to make a cube trai. he used a red cube, a blue cube. a red cube, and another red cube before he started the pattern again. he used 15 cubes. how many red cubes did larry use?

You coordinate volunteers for litter cleanup in local parks. your spreadsheet lists drivers and the number of seat belts in each driver’s car. the spreadsheet calculates the number of drivers (d) and the total number of seat belts (s). you want to know the maximum number of volunteers, besides drivers, that can be transported to the park in a single trip given that each person must have a seat belt of their own.