ഒരു അച്ഛന്റെയും മകന്റെയും ഇപ്പോഴത്തെ വയസ് 7 : 3 എന്ന അനുപാതത്തിൽ ആണ്. ഇവരുടെ വയസ്സുകളുടെ വ്യത്യാസം 36 ആയാൽ മകന്റെ ഇപ്പോഴത്തെ വയസ്സ് എത്ര?
A21
B27
C24
D18
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