there are 42 students in S1A. the number of boys is 4/3 times that of girls. find the respective number of boys and girls there.
Let x be the the number of boys and girls there
中一math
2010-11-09 3:46 am
回答 (3)
2010-11-09 3:57 am
✔ 最佳答案
Let x be the number of girls.x+4/3x=42
7/4x=42
x=42(4/7)
x=24
The number of girls is 24.
The number of boys:
42-24=18
2010-11-17 3:41 am
there are 42 students in S1A. the number of boys is 4/3 times that of girls. find the respective number of boys and girls there.
Let x be the number of boys
x+4/3x =42
3x/3+4x/3=42
7x/3=42
x=18
Let x be the number of boys
x+4/3x =42
3x/3+4x/3=42
7x/3=42
x=18
參考: the book of teacher
2010-11-10 5:49 am
Let x be the the number of girls
(4/3)x + x = 42
4x + 3x = 42*3
7x = 126
x = 126/7
x = 18
then, the number of boys = 42-18 = 24
therefore, the respective number of boys and girls are 24 and 18.
(4/3)x + x = 42
4x + 3x = 42*3
7x = 126
x = 126/7
x = 18
then, the number of boys = 42-18 = 24
therefore, the respective number of boys and girls are 24 and 18.
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