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i think you might have made a small presentation error in part (a), mary is only x years old but you had 2x, i think that’s why the error got carried forward to part (b), hope this helps!
Date Posted:
1 year ago
mary is —> 13-3=10
10/2=5( cus twice +3)
then in 5 years they are
(13+5)+(5+5)=28
does this make sense?