Math problem in the first grade of primary school: the art group made flowers, 38 people made red flowers, 39 people made yellow flowers, and 3 people didn't make flowers. Now there are 60 people in the group, so how many people make both red flowers and yellow flowers?

1。 The first condition of the topic is that there are 60 people in the group and 3 people don't make flowers, so the number of people who make flowers is 60-3=57.

2。 The second condition is that there are 38 people who make red flowers, so only yellow flowers: 57-38= 19 people.

3。 Topic condition 3: 39 people who make yellow flowers, then those who only make red flowers: 57-39= 18 people.

4。 Results The number of people who made safflower and yellow flower was 57-( 19+ 18)=20.