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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.
n (x + y) = 20 + 15 = 35
Total number of boys nx = 20 = 2 x 10 = 4 x 5 = 10 x 2
Total girls = ny = 15 = 3 x 15
The only possibility is n =5, x = 4 and y = 3