Mary paid = 10(56) = ¢560
if the average price drop to ¢52,she paid =52x10 =¢520
She paid less = 560-520 =¢40
The price difference between orange and apple =60-40 = ¢20
so she must put back =40/20 = 2 pieces of orange
ans :B給的答案是E。。。。Mary paid = 10(56) = ¢560 = 8 oranges + 2 apples
let x be the number of oranges that Mary should put back
[(8-x)60 + 2(40)] /(10-x)=52
480x -60x +80 =520-52x
8x = 40
x=5
Ans: E
還有一道GMAT數(shù)學(xué)題
還有一道GMAT數(shù)學(xué)題
At a certain food stand, theprice of each apple is ¢ 40 and the price of each orange is ¢60.Mary selects a total of 10 applesand oranges from the food stand, and the average (arithmetic mean) price of the10 pieces of fruit is ¢ 56.Howmany oranges must Mary put back so that the average price of the pieces offruit that she keeps is ¢ 52?
A.1
B.2
C.3
D.4
E.5
（為什么不選d,4個orange,6個apple,平均價格剛好是52呀）
At a certain food stand, theprice of each apple is ¢ 40 and the price of each orange is ¢60.Mary selects a total of 10 applesand oranges from the food stand, and the average (arithmetic mean) price of the10 pieces of fruit is ¢ 56.Howmany oranges must Mary put back so that the average price of the pieces offruit that she keeps is ¢ 52?
A.1
B.2
C.3
D.4
E.5
（為什么不選d,4個orange,6個apple,平均價格剛好是52呀）
英語人氣：296 ℃時間：2020-09-10 14:53:08
優(yōu)質(zhì)解答
我來回答
類似推薦
- according ot he directions on a can of frozen orange juice concentrate,1 can of concentrate is to be mixed with 3cans of
- 求一道GMAT數(shù)學(xué)題.
- 一道GMAT數(shù)學(xué)題.
- 求助一道GMAT數(shù)學(xué)題
- 求助GMAT一道數(shù)學(xué)題
- Cathy這個英文名怎么讀
- 向淀粉的酸性水解液中直接加入碘水檢驗淀粉是否水解完全
- Shall we go to the movie__?A.in this evening B.on that evening C.this evening D.last evening選擇題?
- 矩陣A,EA=AE么
- 怎樣判斷晨線和昏線 .
- 五岳歸來不看山 的上句是什么
- 三十一人去拔草,十八人去種樹,后又派二十人去支援,拔草人數(shù)是植樹人數(shù)的兩倍,支援拔草的人數(shù),等量關(guān)
猜你喜歡
- 1我在幕天席地的生涯中幕天席地什么意思
- 236.Do you think Tommy is ______ the truth?
- 3tall.old.young .strong.short.這些單詞的比較級
- 4近水樓臺先得月,向陽花木易為春是不是關(guān)于抒懷言志的詩句
- 5三角函數(shù)圖像 平移變換
- 6求下列各方程表示的圓的圓心坐標(biāo)和半徑長
- 7下列現(xiàn)象中屬于做功使物體內(nèi)能增加的是:A水蒸氣將壺蓋頂起 2用火爐給水加熱 3鋼條在水泥地上摩擦變熱 4用太陽能熱水器對水加熱
- 8一個兩位數(shù),它的十位上的數(shù)字比個位上的數(shù)字大4且這個兩位數(shù)比構(gòu)成它的兩個數(shù)碼之和的7倍還要大3.
- 9請問 據(jù)說,我在娘胎時,就“登臺唱戲”了——母親在臺上唱,我在她肚子里唱.引號.破折號作用是什么
- 10九年級上人教版語文書第24課
- 11一個物體從40m的高處自由下落，下落多少米后該物體的動能和重力勢能相等？
- 12尋求靜心的道家心法