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Question 1201373: Hi. How can I solve this? Thanks.
Both Mr Gan and Mr Koon received a salary every month. Last month, Mr Gan's salary was 9/10 of Mr Koon's salary. This month, Mr Gan's salary decreased by $220 while Mr Koon's salary increased by $200. In the end, Mr Gan's salary was 7/10 of Mr Koon's salary. What was Mr Gan's salary last month?
Found 3 solutions by josgarithmetic, MathTherapy, greenestamps:
Answer by josgarithmetic(39630)   (Show Source):
You can put this solution on YOUR website!
Lastmonth Thismonth
Gan 0.9k 0.9k-220
Koon k k+200
"In the end" must mean, "This Month".
 ----------literally according to the description.
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Use found k to evaluate 0.9k.
Answer by MathTherapy(10556)  (Show Source):
You can put this solution on YOUR website!
Hi. How can I solve this? Thanks.
Both Mr Gan and Mr Koon received a salary every month. Last month, Mr Gan's salary was 9/10 of Mr Koon's salary. This month, Mr Gan's salary decreased by $220 while Mr Koon's salary increased by $200. In the end, Mr Gan's salary was 7/10 of Mr Koon's salary. What was Mr Gan's salary last month?
Let Gan's salary, last month, be G
Since last month, Mr Gan's salary was  of Mr Koon's salary, Mr. Koon's salary, last month, was 
With Gan's salary decreasing by $220, Gan's salary, this month, is G - 220.
With Koon's salary increasing by $200, Koon's salary, this month = 
As Gan's salary, this month, was  of Koon's, this month, we get: 
9(G - 220) = 7G + 140(9) ------ Cross-multiplying
9G - 220(9) = 7G + 140(9)
9G - 7G = 140(9) + 220(9)
2G = (140 + 220)(9)
2G = 360(9)
Mr. Gan's salary, last month, or 
Answer by greenestamps(13209)  (Show Source):
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