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[数学] Indian JJ Feb 17th [复制链接]

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发表于 2009-2-19 14:40:11 |只看该作者 |倒序浏览
Indian JJ  Feb 17th

1. If the retail price is 35% more than wholesale price and if the retailer sells it with a profit of 21% with that of wholesale price, then what percentage of discount did he offer to the customer?

(1.35 - 1.21) / 1.35


2. If x > 1 and 0 < y < 1, then Col A: x^4 * y^ 4 / x^2 Col B: x^2 * y^4

C

3. If x < 0, then Col A: -x Col B: |x|

C

4. Given 60% of the students passed in X subject, 50% of the students passed in 'Y' subject and 20% of the students passed in neither of the subjects. If 18 students passed in both the subjects, then how many students passed in neither of the subjects?

Since there are 20% are neither, then 80% students passed one or both subjects. The overlap is 30 percent which equals to 18, therefore the answer is 12. 5. If a number 'n' is divided by 11, it gives remainder

5. What is the remainder when 7n is divided by 5?

i dunno. i couldn't figure it out.
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沙发
发表于 2009-2-20 01:02:40 |只看该作者
anyone willing to verify my answers?

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板凳
发表于 2009-2-22 12:04:24 |只看该作者
if the retailer sells it with a profit of 21% with that of wholesale price
For no.1, the statement above is not clear enough. So I don't know.
I agree with you on No.2 - No.4
For No.5, here is the solution:
let n=11m+5 and m is any whole number=> 7n = 77m + 7*5
=> 7n/5 = 77m/5 + 7
Now, as you can see, M can be any whole number, you can plug in 1,2,3 and try, every time the reminder is different. Therefore it is impossible to tell the remainder. So I am pretty sure the question itself if questionable.

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地板
发表于 2009-2-23 03:32:09 |只看该作者
Thank you!

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发表于 2009-2-23 05:30:40 |只看该作者
I agree that the last question itself is questionable.
fro the rest , no doubt.

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RE: Indian JJ Feb 17th [修改]
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