Answer:
1/4
Explanation:
The number of kids who brought their lunches is 3/7 of 84.
3/7 of 84 = 3/7 * 84 = 3/7 * 84/1 = (3 * 84)/(7 * 1) = 252/7 = 36
36 kids brought their lunches.
9 of the 36 kids got a slice of pizza.
The fraction is 9/36 = 1/4
Answer: 1/4