Re: [計量] 可以幫幫我解幾題數學嗎？？
※ 引述《bluesink (美女又怎樣)》之銘言：
: 1. coins are be put into 7 pockets so that each pocket contains ar least one
: coin. At most 3 of the pockets are to contain the same number of coins and
: no two of the remaining pockets are to contain an equal number of coins.
: What is the least possible number of coins needed for the pockets?
: (A) 7
: (B) 13
: (C) 17.......answer
: (D) 22
: (E) 28
可以解釋成最後會有五種相異錢幣數目
其中一種數目*3
那五種相異數目最小的組合就是12345
如果要讓其中一個數字*3然後還是最小
那個*3的就只能選1
得
sum(1112345)=17
: 2. During a certain season, a team won 80 percent of its first 100 games and 50
: percent of its remaining games. If the team won 70 percent of its games for
: the entire season, what was the total number of games that the team played?
: (A) 180
: (B) 170
: (C) 156
: (D) 150......answer
: (E) 105
Won percentage(勝率)= won#/total game#
Assume totally they played x games
during the first 100 games, it won 80 ==> 80/100,
while in the rest x-100 games, they won 50% ==> they won (x-100)/2 games
Therefore, # of total games they won is 80+(x-100)/2
winning percentage = 70% = [80+(x-100)/2] / x, solve x, and
x=150
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