The ratio of teachers to assistants to children at a day care center is 2: 1: 9. Of the 96 people at the center, how many of them are children?

72

Step-by-step explanation:

Sum the parts of the ratio, 2 + 1 + 9 = 12 parts

Divide the number of people by 12 to find the value of one part of the ratio

96 ÷ 12 = 8 ← value of 1 part of the ratio, thus

9 parts = 9 × 8 = 72 ← number of children

30 feet

step-by-step explanation:

that would be 2 1/2 * 12

= 24 + 6

= 30 feet   (answer)