Use a circle diagram to solve each problem. See Example 7. SIBLINGS When 27 children in...

Use a circle diagram to solve each problem. See Example 7.

SIBLINGS When 27 children in a first-grade class were asked, “How many of you have a brother?” 11 raised their hands. When asked, “How many have a sister?” 15 raised their hands. Eight children raised their hands both times. How many children didn’t raise their hands either time?

Reference Example 7