Can you tell me my age in years?
The first equation (365g = 52s) can be approximated by
7g = s.
As before, the other two equations are
12g = m
g + s + m = 140.
The above system of 3 equations in 3 unknowns (g, s and m) can be simply solved as follows.
g + 7g + 12g = 140 or 20g = 140.
m = 12g = 12 × 140 / 20 = 84.
So, Grandpa is 84 years old.
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