SOLUTION: Monica is one year older than twice of her sister. The difference of their ages is 18. find their present age.

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Question 818814: Monica is one year older than twice of her sister. The difference of their ages is 18. find their present age.
Answer by jhunjiro(67) About Me  (Show Source):
You can put this solution on YOUR website!
Let:
x=age of her sister
2x+1= age of monica
Solution:
age of monica - age of her sister = 18
+%282x%2B1%29+-+x+=+18
+2x-x+=18-1+
+x+=17+ age of her sister
+2x%2B1= age of monica
+2%2817%29%2B1%7D%7D%0D%0A%7B%7B%7B+34%2B1
+35+= age of monica
Final Answer:
Age of Monica is 35.
Age of her sister is 17.