n years ago, daughter was born. So now mother is n+30 and daughter is n
n+30 = 3n+6
n = 12
In 5 years daughter will be 17
n years ago
6(15-n) = 40-n
n = 10
t/2 + (a+7)/3 = t
3a/2 + (a+7)/3 = 3a
9a + 2a+14 = 18a
a = 2
t+7 = 13
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