A class of 20 boys and 15 girls is divided into n groups so that each group has x boys and y girls. Find x, y and n. what values are referred in this class

20 = 2 x 2 x 5

15 = 3 x 5

common divisor (CD) of 20 and 15 is 5 so n should be 5 and each group has 4 boys and 3 girls.

If there are more than one CD, then there are more than one answer.

If they ask for the largest number of groups, greatest common divisor (GCD) will be the answer.