There are 6 Art books in a bookcase. The number of Arts books in that bookcase is 25% that of Scientific fictions, and the number of Scientific fictions is 40% of the whole number of books. How many books are there in the bookcase?
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一條數學問題(英文)
2007-08-23 8:24 am
回答 (4)
2007-08-23 8:31 am
✔ 最佳答案
Let the total number of the books be xx*40%*25%=6
x = 6 / 25% / 40%
x = 60
so, the number of books = 60
2007-08-23 8:35 am
Let ther are X books in the bookcase,
no. of Scientific ficttions=X*40%
no. of Art fictions=(X*40%)*25%=6
X=60
So, there are 60 books in the bookcase.
no. of Scientific ficttions=X*40%
no. of Art fictions=(X*40%)*25%=6
X=60
So, there are 60 books in the bookcase.
參考: myself
2007-08-23 8:35 am
Known: Art books = 6
Let: Whole number of books = W
Science fictions = S
0.4W = S and 0.25S =6
The number of Science fictions: S = 6 / 0.25 then S = 24
The whole number of books: 0.4W = 24 then W = 24 / 0.4 So W = 60
(40% = 0.4 & 25% = 0.25)
Let: Whole number of books = W
Science fictions = S
0.4W = S and 0.25S =6
The number of Science fictions: S = 6 / 0.25 then S = 24
The whole number of books: 0.4W = 24 then W = 24 / 0.4 So W = 60
(40% = 0.4 & 25% = 0.25)
2007-08-23 8:35 am
let x be the number of science fiction books
25%x=6
x=24
let y be the total number of books in the bookcase
40%y=24
y=60
therefore, the total number of books in the bookcase is 60.
25%x=6
x=24
let y be the total number of books in the bookcase
40%y=24
y=60
therefore, the total number of books in the bookcase is 60.
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