To determine how many seconds Lydia juggled, we know that she juggled for 3 more seconds than James, who juggled for 4 seconds.
To find 3 more than 4, we add:
4 (James's seconds) + 3 = 7 seconds.
Therefore, Lydia juggled for 7 seconds.
So, the correct response is:
"To find 3 more than 4, add. 3 + 4 = 7, so Lydia juggled for 7 seconds."