3:1 because she makes 3 times more baskets than John.
If a bowl of fruit contains 8 lemons and 6 oranges, then the ratio of oranges to lemons is eight to six or 8:6 which then can be reduced by to 4:3.
You reduce it by a common factor they share such as 2, because 2 x 4 = 8 and 2 x 3 = 6.
Hope that is the answer you seek.