അച്ഛന്റെയും മകന്റെയും വയസ്സ് തമ്മിലുള്ള അനുപാതം 5:2 പത്തു വർഷത്തിനുശേഷം അച്ഛന്റെ വയസ്സ് മകന്റെ വയസ്സിന്റെ ഇരട്ടിയാണെങ്കിൽ ഇപ്പോൾ മകന്റെ പ്രായമെന്ത് ?
A10
B20
C30
D40
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