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അച്ഛന്റെയും മകന്റെയും വയസ്സ് തമ്മിലുള്ള അനുപാതം 7:3. പത്ത് വർഷത്തിനുശേഷം അച്ഛന്റെ വയസ്സ് മകൻ്റെ വയസ്സിന്റെ ഇരട്ടി യാണെങ്കിൽ ഇപ്പോൾ മകൻ്റെ പ്രായമെന്ത്?

A30

B40

C20

D10

Answer:

A. 30

Read Explanation:

അച്ഛന്റെ വയസ്സ് = 7x മകൻ്റെ വയസ്സ്= 3x 7x + 10 = 2(3x + 10) 10 വർഷത്തിന് ശേഷം 7x + 10 = 6x + 20 7x - 6x = 20 - 10 x = 10 മകന്റെ പ്രായം = 3 × 10 = 30 വയസ്സ്


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