SOLUTION: A man is five times as old as his son. Four years ago he was nine times as old. Find their present ages.
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Question 826115: A man is five times as old as his son. Four years ago he was nine times as old. Find their present ages.
Answer by JBarnum(2146) (Show Source): You can put this solution on YOUR website!
A man is five times as old as his son. Four years ago he was nine times as old. Find their present ages.
For me I use the letter variable of the first letter of the word it stands for to keep it easily understandable in my head.
m=mans age
s=sons age
Ago means past tense so subtraction is required
Use substitution method
Distribute the 9
Subtract 5s from both sides
Add 36 to both sides
Divide by 4
Put back into first equation
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