in 70 ani a pierdut 15,5 kg
70 ani..................15,5kg
1an x
x=4,5 kg =450 g (piele descuamata intr-un an de zile adica in 12 luni)
deci
450g.................................12 luni
y.........................................1 luna
y=37,5 g piele pierduta lunar prin descuamare