Question

Sabendo que x+y=42, determine x e y na proporção x/y=5/9

Answer 1

X = 42 - Y
X = 5Y/9

42 - Y = 5Y/9
9(42 - Y) = 5Y
378 - 9Y = 5Y
378 = 14Y
Y = 27

Answer 2

x+y=42x/y=5/9X = Y  ==>  X + Y = 42   ==> 3
5     9           5 + 9     14

X = 3 ==> X = 5.3 ==> X = 15
5

Y = 3 ==> X = 9.3 ==>Y = 27
9