You can put this solution on YOUR website! Average age at your parents is 45 years.
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(m+d)/2 = 45
m+d = 90
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When your age is counted the avarage 33. What is your age?
(m+d+y)/3 = 33
m+d+y = 99
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Substitute for "m+d" and solve for "y":
90 + y = 99
y = 9 yrs (your age now)
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Cheers,
Stan H.
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