SOLUTION: Sahara is3 times as old as rob. Their ages together add up to 16. How old is sahara? Show me how to write out the equation so i can get the answer.

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Question 655161: Sahara is3 times as old as rob. Their ages together add up to 16. How old is sahara? Show me how to write out the equation so i can get the answer.
Answer by nerdybill(7384) About Me  (Show Source):
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Sahara is3 times as old as rob. Their ages together add up to 16. How old is sahara? Show me how to write out the equation so i can get the answer.
.
Let s = Sahara's age
and r = Rob's age
.
From:"Sahara is3 times as old as rob." we get equation 1:
s = 3r
.
From:"Their ages together add up to 16" we get equation 2:
s+r = 16
.
Substitute 's' as defined in equation 1 into equation 2 and solve for r:
s+r = 16
3r+r = 16
4r = 16
r = 4 years old (Rob's age)
.
Sahara's age:
s = 3r = 3(4) = 12 years old