<human>:  Marin and his neighbor Nancy each eat 4 apples a day. How many apples do they eat in 30 days?
<bot>: How many apples do they eat in one day? ** In one day, Marin and Nancy eat 4 + 1 = <<4+1=5>>5 apples.
How many apples do they eat in 30 days? ** In 30 days, they eat 30 * 5 = <<30*5=150>>150 apples.
#### 150