数学求教~~~请详解~~~

sonic316

1.  when the integer n is divided by 17, the quotient is x and the remainder is 5. when n is divided by 23, 解是y 余数是14，下面哪个正确？

A. 23x+17y=19
B.17x-23y=9
C.17x+23y=19
D.14x+5y=6
E.5x-14y=-6


2.the number of defects in the first five cars to come trough a new production line 是9,7,10,4 和6，respectively. if the sixth car through the production line has either 3,7 or 12 defects, for which of these values does the mean number of defects per car for he first six cars equal the median?

I.3
II.7
III.12

A.只有I
B。只有II
C。只有III
D.只有I 和III
E。I ,II 和III

3.今天，A is 3 times as old as P, in 13 years, A will be one year less than twice as old as P will be then. How many years old is A today?


4. S公司生产两种stereos：B 和 D。 of the stereos produced by S公司 last month, 2/3 were B and the rest were D. if it takes 7/5 asmany hours to produce a D as it does to produce a B, then the number of hours it took to produce D last month was what fraction of the total number of hours it took to produce all the stereos?

A.7/17
B.14/31
C.7/15
D.17/35
E.1/2


5. 一个商人购进一个夹克为$60  and then determined a selling price that equalled the purchase price of jacket plus a markup that was 25% of the selling price. During a sale, the merchant discounted the selling price by 20% and sold the jacket. what was the merchant`s gross profit on this sale?

A.$0
B.$3
C.$4
D.$12
E.$15



求好心人帮我详解一下这些题，我英文可能有时候可能翻译不准，所以就直接抄下原题了。

hnqxsky

第一题显然是B 17x+5=23y+14

sdcar2010

2.the number of defects in the first five cars to come trough a new production line 是9,7,10,4 和6，respectively. if the sixth car through the production line has either 3,7 or 12 defects, for which of these values does the mean number of defects per car for he first six cars equal the median?

I.3
II.7
III.12

A.只有I
B。只有II
C。只有III
D.只有I 和III
E。I ,II 和III

DDDDDDDDDDD

For this one, you only need to calculate the average (mean) and the median of the series of number you get.

sdcar2010

3.今天，A is 3 times as old as P, in 13 years, A will be one year less than twice as old as P will be then. How many years old is A today?

A : x years old
P : y years old

3y = x; (y+13)*2 -1 = x +13
y = 12, x =36

sdcar2010

4. S公司生产两种stereos：B 和 D。 of the stereos produced by S公司 last month, 2/3 were B and the rest were D. if it takes 7/5 asmany hours to produce a D as it does to produce a B, then the number of hours it took to produce D last month was what fraction of the total number of hours it took to produce all the stereos?

A.7/17
B.14/31
C.7/15
D.17/35
E.1/2

Categories      B        D
number         2a       a
time/each       1      7/5
total time        2a    7/5 a

fraction of D = 7/17


AAAAAAAAAAAAAAA

sdcar2010

5. 一个商人购进一个夹克为$60  and then determined a selling price that equalled the purchase price of jacket plus a markup that was 25% of the selling price. During a sale, the merchant discounted the selling price by 20% and sold the jacket. what was the merchant`s gross profit on this sale?

A.$0
B.$3
C.$4
D.$12
E.$15

selling price = $80
sale price = $64
profit = $4

CCCCCCCCCCCCCcc

sonic316

这个题的问题我还是有点没太明白，能帮我翻译一下这道题的问题吗？谢了

sonic316

2.the number of defects in the first five cars to come trough a new production line 是9,7,10,4 和6，respectively. if the sixth car through the production line has either 3,7 or 12 defects, for which of these values does the mean number of defects per car for he first six cars equal the median?

I.3
II.7
III.12

A.只有I
B。只有II
C。只有III
D.只有I 和III
E。I ,II 和III

DDDDDDDDDDD

For this one, you only need to calculate the average (mean) and the median of the series of number you get.

-- by 会员 sdcar2010 (2011/2/22 11:23:00)

这道题的问题我可能没翻译明白，能帮我翻译一下这道题的问题吗？谢了

sonic316

多谢多谢了~~~~~

rx_11

LZ~~~这些是什么题？是钩钩么？