SOLUTION: Margarette is twice as old as Isabela. If the age of Margarette is added to half the age of Isabela, the result is 60. Whate were their ages 7 years ago? (please answer with only o

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Question 1130585: Margarette is twice as old as Isabela. If the age of Margarette is added to half the age of Isabela, the result is 60. Whate were their ages 7 years ago? (please answer with only one variable. thanks in advance)
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +a+ = Isabela's age now
+2a+ = Margarette's age now
+2a+%2B+%281%2F2%29%2Aa+=+60+
------------------------------------
+4a+%2B+a+=+120+
+5a+=+120+
+a+=+24+
and
+2a+=+48+
---------------------
+24+-+7+=+17+
+48+-+7+=+41+
Isabela was 17
Margarette was 41