A sum of money is eveny distributed to 15 people. If the amount remains unchanged,
but the number of people is increased by 20%, find the percentage decrease of the
amount each one receives.
~~快~~
~~thx~~
~~Maths 一問~~ Form1仔
2007-12-08 8:39 pm
回答 (2)
2007-12-08 9:00 pm
✔ 最佳答案
Let the amount of number be xif the number of people is increased by 20%,
the NEW number of people will be 15 x 1.2 = 18
the percentage decrease of the amount each one receives :
x/18 - x/15
---------------- x 100%
x/15
1/18 - 1/15
= ---------------- x 100% = -16.67%
1/15
參考: 我同我呀哥 -v-
2007-12-08 9:23 pm
let y be the number of the sum of money
amount remains: y/15
when the number of people is increased by 20%,
the number of people now is: 15X(1+20%)=18
so the percentage decreased of amount each one receives is:
(y÷18-y÷15)÷(y÷15)X100%
=(y÷3)/(y÷15)X100%
=(100÷5)%
=20%//
amount remains: y/15
when the number of people is increased by 20%,
the number of people now is: 15X(1+20%)=18
so the percentage decreased of amount each one receives is:
(y÷18-y÷15)÷(y÷15)X100%
=(y÷3)/(y÷15)X100%
=(100÷5)%
=20%//
參考: myself
收錄日期: 2021-05-01 15:42:26
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071208000051KK01341