There are 42 students in F.1A.The number of boys is 1/3 more than of girls.Find the numbers of boys and girls respectively.
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2007-05-12 1:58 am
回答 (4)
2007-05-12 2:05 am
✔ 最佳答案
Let x be the number of girls in F.1Athen, (1+1/3)x = 4x/3 is the number of boys in F.1A
x + 4x/3 = 42 (Total number of students in F.1A)
7x/3 = 42
x/3 = 6
x = 18
So, there are 18 girls in F.1A.
Also, there are:
4(18/3)
= 24 boys in F.1A
參考: Myself~~~
2007-05-12 2:08 am
Assume number of girls is X. then the number of boys is (1+1/3)X
So,
X + (1+1/3)X = 42
X = 18 = girl number
(1+1/3)*18 = 24 = boys number
So,
X + (1+1/3)X = 42
X = 18 = girl number
(1+1/3)*18 = 24 = boys number
2007-05-12 2:06 am
Let a be the number of the girls.
4/3a+a=42
7/3a=42
a=18
The number of the girls is 18.
The number of the boys.
18+18x1/3
=24
The number of the boys is 24.
4/3a+a=42
7/3a=42
a=18
The number of the girls is 18.
The number of the boys.
18+18x1/3
=24
The number of the boys is 24.
2007-05-12 2:06 am
let there are y girls and y(1+1/3) boys in the class
y + y(1+1/3) = 42
y + y(4/3) = 42
(7/3)y = 42
y = 18
18 girls
18(1+1/3) = 24 boys
y + y(1+1/3) = 42
y + y(4/3) = 42
(7/3)y = 42
y = 18
18 girls
18(1+1/3) = 24 boys
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