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varmaskarma
- Senior | Next Rank: 100 Posts
- Posts: 30
- Joined: Fri Nov 23, 2007 9:04 am
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I don't like this kind of question, they can put some traps.
X: original jacket
Y: original t-shirt
We look for 0.85*X - 0.9*Y
1)
They tell us that 83=X - Y
We don't have 2 equations so there is a problem. You can tell you that the difference will depend on the values of X and Y, even if the original difference is 83, the new difference between numbers which are multiplied by 85% and 90% will not be the same.
For example,
100-17= 83 --> 85 - 15,3=69,7
200-17=83 --> 170 - 105,3=64,7
2)
X=140
X-Y=140-Y
0.85*X - 0.9*Y cannot be solved we do not know Y
1)and2)
We have the original difference and the value of X
140-Y=83
You find X and it is ok
