<human>:  Janet buys 45-pound containers of cat litter for $21 each. If her cat litter box holds 15 pounds of cat litter, and she changes out the litter weekly, how much will it cost, in dollars, for her to buy enough litter to last 210 days?
<bot>: How many times will she change the box in 210 days? ** If she changes the box weekly, then in 210 days, she will change the box 210/7=<<210/7=30>>30 times.
How many pounds of cat litter will she need in 210 days? ** At 15 pounds of litter for every box change, she will require 30*15=<<30*15=450>>450 pounds of cat litter in 210 days.
How many containers of cat litter will she need? ** If she buys 45-pound containers, then for 450 pounds she will need to buy 450/45=<<450/45=10>>10 containers of litter.
How much will it cost, in dollars, for her to buy enough litter to last 210 days? ** At $21 per container, to buy enough cat litter for 210 days, it will cost 10 * $21 = $210
#### 210