<human>:  There were 40 kids on Lake Pleasant. A fourth of the kids went tubing, but only half of the tubers went rafting. How many of the kids who joined the rafting excursion were also on the tubing excursion?
<bot>: How many kids went tubing? ** 40/4 = <<40/4=10>>10 kids went tubing.
How many kids went rafting and tubing? ** 10/2 = <<10/2=5>>5 kids went rafting and tubing.
#### 5