You can put this solution on YOUR website! Anna's mother will in 12yrs be three times as old as she was 20yrs ago, how old is Anna's mother now
:
m + 12 = 3(m-20)
m + 12 = 3m - 60
12 + 60 = 3m - m
72 = 2m
m = 36 yr now
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:
Check this
36 + 12 = 3(36-20)
48 = 3(16)
