SOLUTION: Please help me solve this problem:Your grandfather is 5 times as old as you. The sum of your ages is 72. Find the age of your grandfather. (Use elimination method)

Algebra ->  Linear-equations -> SOLUTION: Please help me solve this problem:Your grandfather is 5 times as old as you. The sum of your ages is 72. Find the age of your grandfather. (Use elimination method)      Log On


   

Question 855100: Please help me solve this problem:Your grandfather is 5 times as old as you. The sum of your ages is 72. Find the age of your grandfather. (Use elimination method)
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +a+ = your age
Let +b+ = your grandfather's age
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(1) +a+%2B+b+=+72+
(2) +b+=+5a+
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Substitute (2) into (1)
(1) +a+%2B+5a+=+72+
(1) +6a+=+72+
(1) +a+=+12+
and
(2) +b+=+5a+
(2) +b+=+5%2A12+
(2) +b+=+60+
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the grandfather's age is 60