അമ്മയുടെയും മകന്റെയും ഇപ്പോഴത്തെ പ്രായത്തിന്റെ അംശബന്ധം 5 : 1 ആണ്. പതിനാല് വർഷം കഴിഞ്ഞ് അവരുടെ പ്രായത്തിന്റെ അംശബന്ധം 3 : 1 ആയിരിക്കും. എങ്കിൽ അമ്മയുടെ പ്രായം എത്രയാണ്?
A68 വയസ്
B70 വയസ്
C56 വയസ്
D65 വയസ്
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