At the Johnson family reunion, there were 45 children and one third as many adults. One third of the adults wore blue. How many adults did not wear blue?
A step-by-step solution is:
10
One third as many adults as children is 45 / 3 = 15 adults.

One third of adults wore blue, or 15 / 3 = 5 adults wore blue.

Thus, the remaining 15 - 5 = 10 adults did not wear blue.

.

The answer: 10