The sixth grade students signed up to participate in the mathematics interest group. The number of students who participated was 13 of the total number of sixth grade students. Later, 20 students participated. At this time, the ratio of the number of students who participated and those who did not participated was 3:4______ People

The sixth grade students signed up to participate in the mathematics interest group. The number of students who participated was 13 of the total number of sixth grade students. Later, 20 students participated. At this time, the ratio of the number of students who participated and those who did not participated was 3:4______ People

20 (33 + 4 − 13) = 20 (221) = 210 (people) a: there are 210 people in Grade 6

The sixth grade students signed up to participate in the mathematics interest group. The number of students who participated was 13 of the total number of sixth grade students. Later, 20 students participated. At this time, the ratio of the number of students who participated and those who did not participated was 3:4______ People

20 (33 + 4 − 13) = 20 (221) = 210 (people) a: there are 210 people in Grade 6