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3/4*x = rojas
queda 1/4*x
1/4*x * 1/5= azules
3/4*x + 1/4*x * 1/5 + 20 = x
3/4*x + 1/20*x+20= x
3/4*x + 1/20*x = x - 20
15x/20 + x/20 = x - 20
16x/20 = x - 20
16x= 20 (x-20)
16x= 20x - 400
400= 20x -16x
400= 4x
100=x
3/4*x = rojas
3/4*100 = 75 rojas
1/4*x * 1/5= azules
1/20*x= azules
1/20 * 100= 5 azules