Question

How old was the Grandfather?​

Answer 1

Answer:

The above system of 3 equations in 3 unknowns (g, s and m) can be simply solved as follows. g + 7g + 12g = 100 or 20g = 100. m = 12g = 12 x 100 / 20 = 60. So, Grandpa is 60 years old.

Explanation:

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Answer 2

Answer:

80 years

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