The respective ratio between the present age of son - mother - father and grandfather is 2 : 7 : 8 : 12. The average age of son and mother Is 27 years. What Will be mother-™s age after 7 years?

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The respective ratio between the present age of son - mother - father and grandfather is 2 : 7 : 8 : 12. The average age of son and mother Is 27 years. What Will be mother-™s age after 7 years?