<human>:  William's class set a goal each week of the number of cans of food that is to be collected. On the first day, 20 cans were collected. Then the number of cans increased by 5 each day. If they collected 5 days a week to reach their goal, how many cans of food was their goal per week?
<bot>: How many cans did they collect on the second day? ** On the second day, they collected 20 + 5 = <<20+5=25>>25 cans.
How many cans did they collect on the third day? ** On the third day, they collected 25 + 5 = <<25+5=30>>30 cans.
How many cans did they collect on the fourth day? ** On the fourth day, they collected 30 + 5 = <<30+5=35>>35 cans.
How many cans did they collect on the fifth day? ** On the fifth day, they collected 35 + 5 = <<35+5=40>>40 cans.
How many cans of food is their goal per week? ** Thus, the goal of William's class is to collect a total of 20 + 25 + 30 + 35 + 40 =<<20+25+30+35+40=150>>150 cans of food per week.
#### 150