Answer:
5
Explanation:
To find the least number of students in the group, we need to find the least common multiple (LCM) of the denominators 4 and 5, which is 20.
Since 1/4 of the students have math homework, we can calculate this fraction by multiplying the total number of students (20) by 1/4:
20 x 1/4 = 5
So, 5 students have math homework.
Similarly, since 1/5 of the students have science homework, we can calculate this fraction by multiplying the total number of students (20) by 1/5:
20 x 1/5 = 4
Therefore, 4 students have science homework.
To find the least number of students in the group, we need to consider the maximum of these two values, which is 5.
Therefore, the least number of students in the group is 5.