<human>:  A bird eats 7 berries a day. Samuel has 5 birds. How many berries do Samuel's birds eat in 4 days?
<bot>: How many berries does a bird eat in 4 days? ** A bird eats 7 x 4 = <<7*4=28>>28 berries in 4 days.
How many berries do Samuel's birds eat in 4 days? ** So, 5 birds can eat 28 x 5 = <<28*5=140>>140 berries in 4 days.
#### 140