SOLUTION: Samy is twice as old as Rubina was 2 years ago. If the difference of their ages be 2 years how old is Samy today??

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Question 964051: Samy is twice as old as Rubina was 2 years ago. If the difference of their ages be 2 years how old is Samy today??
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +s+ = Samy's age now
Let +r+ = Rubina's age now
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(1) +s+=+2%2A%28+r+-+2+%29+
(2) +s+-+r+=+2+
-----------------------
(2) +s+=+r+%2B+2+
Substitute (2) into (1)
(1) +r+%2B+2+=+2%2A%28+r+-+2+%29+
(1) +r+%2B+2+=+2r+-+4+
(1) +r+=+2+%2B+4+
(1) +r+=+6+
and
(2) +s+=+r+%2B+2+
(2) +s+=+6+%2B+2+
(2) +s+=+8+
Samy is 8 today
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check:
(1) +s+=+2%2A%28+r+-+2+%29+
(1) +8+=+2%2A%28+6+-+2+%29+
(1) +8+=+2%2A4+
(1) +8+=+8+
OK