I did this problem last year, if I remember you do this:
64 pounds of gravel and <span>108 pounds of mulch will be the outcome </span> *2 1/4 will be equal to 2.25 *1 1/3 will be equal to 1.33 ------------------------------------ 2.25 / 1.33 = 1.7 is fine (rounded up) ------------------------------------ *ratio of gravel = 1.7: 1 ------------------------------------ FOR MULCH: 1.7/2.7 from 172 you will use the outcome 0.629 * 172 to get 108.2 pounds ------------------------------------ FOR GRAVEL: 172 - 108.2 = 63.8 pounds ------------------------------------ Totals sold will be: - 108 Pounds - 64 Pounds