Chuck needs to fertilize 135 shrubs, each requiring 1/2 pound of fertilizer. How many bags of fertilizer does he need to purchase?

To determine how many bags of fertilizer Chuck needs to purchase, first calculate the total amount of fertilizer required for the 135 shrubs. Each shrub requires 1/2 pound of fertilizer. Therefore, the total amount of fertilizer needed is calculated by multiplying the number of shrubs by the amount of fertilizer each shrub needs:

Total fertilizer required = Number of shrubs × Fertilizer per shrub

Total fertilizer required = 135 shrubs × 1/2 pound/shrub

Calculating this, we can convert it to a simpler multiplication:

135 × 1/2 = 67.5 pounds of fertilizer.

Next, consider how many bags of fertilizer Chuck needs. If we assume that each bag of fertilizer contains a standard size (for example, 10 pounds per bag), we can divide the total amount needed (67.5 pounds) by the weight of one bag (10 pounds):

Number of bags required = Total fertilizer required ÷ Weight per bag

Number of bags required = 67.5 pounds ÷ 10 pounds/bag = 6.75 bags.

Since he cannot purchase a fraction of a bag, he will need to round up to the next whole number, which is 7 bags. This ensures that he has enough fertilizer to