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ayer = x
hoy = 3/5 de x
entonces nuestra ecuacion seria:
x - 3/5x = 30 hallamos m.c.m.
5x - 3x = 150
2x = 150
x = 75
entonces 3/5 de 75 es igual a 45
and this is the answer... thanks you very much for the exercise....
see you later...
ayer : 30 + x
x = 3/5 *(30+x) , efectuando
5x = 3(30+x)
5x = 90 + 3x
5x - 3x = 90 ----> 2x = 90 -----> x = S/. 45