1.There are 36 students in F.1B Some of the student bring their own lunch, while some of them buy lunch boxes . If 1/4 of the students who usually bring their own lunch buy lunch boxes become 1:2. How many students are there who usually bring their own lunch?
2.Eric and Simon have a total of 12 story books. If Eric gives 1/2 of his story books to Simon, the ratio of their story books become 1:1. How many story books does each of them have originally?
F.1數學題
2007-03-02 5:07 am
回答 (2)
2007-03-02 5:18 am
✔ 最佳答案
1. Let x be the number of students who ususally bring their own lunch. Thenx - x/4 = 36 * [1/(1+2)]
3x/4 = 12
x = 16
2. using similar method as Q1.
2007-03-02 5:50 am
1. do u mean: the ratio of students who bring their own lunches to students who buy lunch boxes is 1:2?
answer: 12 usually bring their own lunch.
2. make original no. of eric's books e
make original no. of simon's books s
e + s = 12
e x 0.5 = s x 1.5
therefore, eric originally has 9 books, simon 3
answer: 12 usually bring their own lunch.
2. make original no. of eric's books e
make original no. of simon's books s
e + s = 12
e x 0.5 = s x 1.5
therefore, eric originally has 9 books, simon 3
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