<human>:  Helena is a mad scientist testing her latest creation, the Lots-of-Limbs Serum. The serum will make the drinker grow an extra arm every three days and an extra leg every five days. After fifteen days, how many new limbs will Helena’s serum cause a person to grow if they drink it?
<bot>: How many extra arms would a person grow after 15 days? ** At one new arm every 3 days, after 15 days, a person who drank Helena’s serum would grow 15 / 3 = <<15/3=5>>5 extra arms.
How many extra legs would a person grow after 15 days? ** At one new leg every 5 days, after 15 days, the person would grow 15 / 5 = <<15/5=3>>3 extra legs.
How many new limbs would a person grow after 15 days? ** In all, someone who drank Helena’s serum would grow 5 + 3 = <<5+3=8>>8 new limbs after 15 days.
#### 8