Jim spent $111 in the supermarket to buy oranges, apples and mangos. Oranges cost $2 each, apple cost $3 each and Mangos cost $5 each. Ifthe number of oranges, apples and mangos he bought is 32 and he bought two times more apples than oranges, then how many of each fruit did he buy?
問一條中二英數!
2011-02-02 7:43 pm
回答 (1)
2011-02-02 8:31 pm
✔ 最佳答案
let oranges , apples and mangos be y,a and m.y+a+m=32 ... (1)
2y = a ... (2)
2y+3a+5m = 111 ... (3)
from(1), m = 32 - a - y
from(2), m = 32 - a - 0.5 a ... (4)
put (4), (2) into (3),
a+3a+5(32-a-0.5a) = 111
4a + 160 - 5a - 2.5a = 111
-3.5a = - 49
a = 14
put a = 14 into (2)
2y= 14
y=7
put y=7 and a = 14 into (1),
7+14+m=32
m = 32-14-7
m=11
If any where you don't understand, you can ask me =]
2011-02-02 12:48:44 補充：
so, jim bought 7 oranges, 11 mangos and 14 apples
參考: me
收錄日期: 2021-04-13 17:49:35
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110202000051KK00336