Final answer:
To find the number of people in the garden, subtract the number of people in the yard from the total number of people.
Step-by-step explanation:
To find the number of people in the garden, we need to subtract the number of people in the yard from the total number of people. In this case, we have 34 people in the yard. So, to find the number of people in the garden, we subtract 34 from the total number of people.
Total number of people = 17 + 20 + 21 + 18 + 20 + 20 + 20 + 18 + 19 + 19 + 20 + 19 + 21 + 20 + 18 + 20 + 20 + 19 + 18 + 19 + 17 + 19 + 17 + 21 + 17 + 21 + 18 + 21 + 19 + 21 + 20 + 17 + 20 + 18 + 19 + 20 + 20 + 17 + 21 + 20
= 739.
Therefore, the number of people in the garden would be the total number of people minus the number of people in the yard: 739 - 34 = 705.