Question 1044405: Help me with this question please.
At present Mary is four younger than her brother Tom.If Tom is n years old,what will be the sum of their age in three years time?If the sum of their age is 15 then,how old will Tom be?
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! At present Mary is four younger than her brother Tom. If Tom is n years old,what will be the sum of their age in three years time?
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The difference remains 4 years.
Tom is n, Mary is n-4.
In 3 years, Tom will be n+3, Mary will be n-1.
(n+3) + (n-1) = 2n+2
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If the sum of their age is 15 then,how old will Tom be?
How old will he be when?
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Now?
T - M = 4
T + M = 15
------------- Add
2T = 19
Tom is 9.5
Mary is 5.5
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