A&B have 48 and 72 books respectively. If A borrows some books from B, the ratio of the no. of A's books to that of B becomes 13:17. Find the no. of books that A borrowed from B.
請列式,thx!!
F.2 maths``plz help&fast!!
2007-10-03 2:42 am
回答 (4)
2007-10-03 2:51 am
✔ 最佳答案
A+B = 48+72 = 120booksof the no. of A's books to that of B becomes 13:17 (呢度有書30份,A分到13份,B分到17分,所以每份有書
120/(13+17) = 4
A有13份而每份係4本書,所以A有4x13 = 52
本來A有48本 但而家係52本,所以52-48 = 4
The no. of books that A borrowed from B is 4
參考: My Maths & English Knowledge
2007-10-03 2:55 am
let A has borrows x books from B.
(48+x)/(72-x)=13:17
816+17x=936-13x
30x=120
x=4
So, A has borrows 4 books from B
(48+x)/(72-x)=13:17
816+17x=936-13x
30x=120
x=4
So, A has borrows 4 books from B
2007-10-03 2:51 am
A向B借X本書
借書後A有48+X本書
B有72-X本書
(48+X):(72-X)=13:17
13*(72-X)=17*(48+X)
936-13X=816+17X
X=4
借書後A有48+X本書
B有72-X本書
(48+X):(72-X)=13:17
13*(72-X)=17*(48+X)
936-13X=816+17X
X=4
2007-10-03 2:47 am
設A借了B有x本書
(48+x)/(72-x)=13/17
816+17x=936-13x
30x=120
x=4
So, B borrows 4 books to A
(48+x)/(72-x)=13/17
816+17x=936-13x
30x=120
x=4
So, B borrows 4 books to A
收錄日期: 2021-05-03 06:01:06
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071002000051KK02618