###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?, ### Assistant: 40/4 = 10 kids went tubing.
10/2 = 5 kids went rafting and tubing. 
 So the answer is :  5