數學題 100隻雞

iantsang

I got the same answer, based on the target of reaching $100 per 100 chicken, that means, $1 per chicken will be optimal.

In order to achieve that, buying 4 chicken (1 medium and 3 small) would costs $4, i.e. average $1 per chicken as desired.

So, every 4 (1 medium and 3 small) x 25, would give us 100 chicken, that is 25 medium and 75 small.

If try to solve this mathematically, this is not really possible since there are 3 variables and only 2 equations as following:

5a + 3b +1/3c = 100
a + b + c = 100

If a = 0,

then 3b + 1/3c = b + c, so c = 3b
so 0 + b + 3b = 100, i.e. b = 25 and c = 75.    

原帖由 fungsir 於 10-5-23 01:18 發表
中雞 3元/ 1隻：    買25隻，要 75元
小雞 1元/ 3隻：    買75隻，要 25元


結果：

買 100隻雞，用了 $100元。
但無大雞食woo   

iantsang

原帖由 君媽 於 10-5-23 11:22 發表


大雞4隻 = 20元
中雞18隻 = 54元
小雞78隻 = 26元

100元買100隻。