SOLUTION: marks dad is 3 times as old as mark . The sum of their ages is 48 , how old is mark?

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Question 536222: marks dad is 3 times as old as mark . The sum of their ages is 48 , how old is mark?
Found 2 solutions by oberobic, algebrahouse.com:
Answer by oberobic(2304) (Show Source):
You can put this solution on YOUR website!
Dad = 3*Mark
D = 3M
.
D+M = 48
so
D = 48-M
.
substitute
.
48-M = 3M
48 = 4M
4M = 48
M = 12
.
D = 3M
D = 3*12 = 36
.
Answer: Mark's dad is 36, and Mark is 12.
.
Done.

Answer by algebrahouse.com(1659) (Show Source):
You can put this solution on YOUR website!
"marks dad is 3 times as old as mark . The sum of their ages is 48 , how old is mark?"

x = Mark's age
3x = Mark's dad's age {Mark's dad is 3 times Mark}

x + 3x = 48 {sum of ages is 48}
4x = 48 {combined like terms}
x = 12 {divided both sides by 4}

Mark is 12

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