GWD1-11

[Martina]

Q11.
Mary persuaded n friends to donate $500 each to her election campaign, and then each of these n friends persuaded n more people to donate $500 each to Mary’s campaign. If no one donated more than once and if there were no other donations, what was the value of n?
(1)The first n people donated of the total amount donated.
(2) The total amount donated was $120,000.

ANS: D

這題不知怎ㄇ列式, 請大家幫幫忙巴

[nana]

Q11.
Mary persuaded n friends to donate $500 each to her election campaign, and then each of these n friends persuaded n more people to donate $500 each to Mary’s campaign. If no one donated more than once and if there were no other donations, what was the value of n?
(1)The first n people donated of the total amount donated.
(2) The total amount donated was $120,000.

ANS: D

這題不知怎ㄇ列式, 請大家幫幫忙巴

total=500n+n(500n)=500n(1+n)
(1)500n/500n(1+n)=1/1+n=1/16 n=15
(2)500n(1+n)=120000 n=15

[becker]

請問一下，條件一中文翻譯是什麼意思，看到條件一的解說，不知道16怎麼跑出來的。

[小紅豆]

條件一是說


500n(n個朋友一個人捐500)/500n+n(500n)(是總捐款 )

[becker]

對不起，資質愚笨，那請問數學式

500n/500n(1+n)=1/1+n=1/16，這個16是哪邊跑出來的。

[liwuu]

對不起，資質愚笨，那請問數學式

500n/500n(1+n)=1/1+n=1/16，這個16是哪邊跑出來的。

當初題目post的時候出現一點問題
原條件一為The first n people donated 1/16 of the total amount donated.

[becker]

感謝，原來是會一場。

[Patty Wang]

對不起，想了又想還是不了1/16的意思?想不出來為什麼?語意也看不出? 請幫幫忙一下，謝謝!!

原條件一為The first n people donated 1/16 of the total amount donated.

[Emilyh]

500n(n個朋友一個人捐500)/500n+n(500n)(是總捐款 )

請問n(500n)是怎麼來的?

謝謝

[FrankChang]

500n(n個朋友一個人捐500)/500n+n(500n)(是總捐款 )

請問n(500n)是怎麼來的?

謝謝

n個朋友在各自去找n個人,n*n*500