SOLUTION: can you please help me to answer this question thank you Mang casar is 20 years older than his son. in 5 years he will be 3 times as old as his son. find their present age.

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Question 187894: can you please help me to answer this question thank you
Mang casar is 20 years older than his son. in 5 years he will be 3 times as old as his son. find their present age.
Answer by ptaylor(2198) About Me  (Show Source):
You can put this solution on YOUR website!
Let x=son's age; x+5=son's age in 5 years
Then x+20=Mang's age; x+20+5=x+25=Mang's age in 5 years
Now we are told that:
x+25=3(x+5) get rid of parens
x+25=3x+15 subtract x and also 15 from each side
x-x+25-15=3x-x+15-15 collect like terms
10=2x divide each side by 2
x=5---------------------------------son's present age
x+20=5+20=25-------------------------Mang's present age
CK
5+25=3(5+5)
30=30
Hope this helps---ptaylor