kfsdgte的部落格

標題:

Maths (急) thx

發問:

1,Mr Lam bought 30 mobile phones at $1600.He then sold 16 mobile phones for $1750 and 14 mobile phones for $1400.How much did he gain or loss ?2,There are 400 animals in a zoo,in which 180 of them are birds.What percentage of birds is therein the zoo ?3,If 50 tennis rackets are sold for $20000,the profit per... 顯示更多 1,Mr Lam bought 30 mobile phones at $1600.He then sold 16 mobile phones for $1750 and 14 mobile phones for $1400.How much did he gain or loss ? 2,There are 400 animals in a zoo,in which 180 of them are birds.What percentage of birds is therein the zoo ? 3,If 50 tennis rackets are sold for $20000,the profit per cent is 25%.Find the cost price of each tennis racket. 4,If 25% of a number is 175,find the number. HeLp!!~Thx}}'/

最佳解答:

1.16x1750+14x1400-30x1600 =28000+19600-48000 = -400 2.(180/400)x100% =45% 3.(20000/50)/(1+25%) =400/125% =320 4.175/25% =175x4 =700

其他解答:

1) Net feedback = 16*1750 + 14*1400 - 30*1600 = -400 So, he lost $400 2) % = (180/400)*100%=45% 3) Let $N be the cost price of each tennis racket N*(1+25%)*50=20000 N*1.25*50=20000 N=320 So, the cost price of each tennis racket is $320 4) Let X be the required number X*25%=175 X*0.25=175 X=175/0.25=700

• 叛逆歲月7閱讀報告_0@1@
• 江湖聊天室：神威江湖最近經常無法進入問題@1@
• math P.6方程
• socket 478 問題 10分
• 邊間 salon haircut 好!-
• 請問鴻隆新股邊度有得拎表呀-_0
• http response 中文版..急用 ..就黎考cit_7
• 超緊急!!!求大大們解答以下兩個問題(20分)
• 急求魯肉飯食譜
• 古代有多少個朝-_0@1@

此文章來自奇摩知識+如有不便請留言告知

0D7DAC4E7B8CAAC5