SOLUTION: Zeina is 4 years older than wadiha. 6 year ago, zeina’s age was twice wahida’s age. How old are they now?

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Question 1046004: Zeina is 4 years older than wadiha. 6 year ago, zeina’s age was twice wahida’s age. How old are they now?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +z+ = Zeina's age now
Let +w+ = Wadiha's age now
-----------------------------
(1) +z+=+w+%2B+4+
(2) +z+-+6+=+2%2A%28+w+-+6+%29+
-----------------------------
Substitute (1) into (2)
(2) +w+%2B+4+-+6+=+2%2A%28+w+-+6+%29+
(2) +w+-+2+=+2w+-+12+
(2) +w+=+10+
and
(1) +z+=+10+%2B+4+
(1) +z+=+14+
Zeina's age now is 14
Wadiha's age now is 10
------------------------
check:
(1) +z+=+w+%2B+4+
(1) +14+=+10+%2B+4+
(1) +14+=+14+
and
(2) +z+-+6+=+2%2A%28+w+-+6+%29+
(2) +14+-+6+=+2%2A%28+10+-+6+%29+
(2) +8+=+2%2A4+
(2) +8+=+8+
OK