SOLUTION: Pedro has 209 mango trees and star apple trees.If he had 23 more mangoes and 18 fewer star apple trees,the number of mango trees would equal the number of star apple trees. How

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Question 906445: Pedro has 209 mango trees and star apple trees.If he had 23 more mangoes and 18 fewer star apple trees,the number of mango trees would equal the number of star apple trees. How many mango trees does he have?( answer is 84 show your solution)
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +m+ = number of mango trees he has
Let +s+ = number of star apple trees he has
----------------
(1) +m+%2B+s+=+209+
(2) +m+%2B+23+=+s+-+18+
-----------------------
(2) +m+-+s+=+-41+
Add (1) and (2)
(1) +m+%2B+s+=+209+
(2) +m+-+s+=+-41+
--------------------
+2m+=+168+
+m+=+84+
and
(1) +s+=+m+%2B+41+
(1) +s+=+84+%2B+41+
(1) +s+=+125+
------------------
He has 84 mango trees
check:
(2) +m+%2B+23+=+s+-+18+
(2) +84+%2B+23+=+125+-+18+
(2) +107+=+107+
OK