like "there are seven more girls than boys. if the class has 23 members, how many girls are in the class?" can you write how i got it like x+x=?
2007-09-24 12:14:46 · 11 answers · asked by darren 1 in Education & Reference ➔ Homework Help
there are 15 girls in the class altogether and eight boys.
If there are 23 people in the class altogether and there are seven more boys then girls, then you subtract 7 from 23
eg. 23 - 7=16
And then you divide 16 by 2 which will tell you how many boys and girls.
eg. 16 / 2 = 8
So there are 8 boys and 15 girls (seven more girls then boys).
These questions can get sooooo confusing hey? You just need to work through them bit by bit
Goodluck!!
2007-09-24 12:19:00 · answer #1 · answered by angel 4 · 0⤊ 0⤋
There are 15 girlzz in the class.
23 - 7 = 16
16 / 2 = 8
8 + 7 = 15
(x - 7) / 2 + 7 = y
x = total class memberzz
y = total girlzz in class
2007-09-24 19:22:53 · answer #2 · answered by helpizzneeded 2 · 0⤊ 0⤋
So, first thing to do is pick one to be the
variable either boys or girls
and we know
boys+girls=students
is the equation we need.
students=23
if x=boys
then girls=x+7
because there are 7 more
(more means addition)
substitute the values into
the equation
and
boys+girls=students
becomes
x + (x +7)= 23
x+x+7=23 (subtract 7 from each side)
x+x=16
2x=16 (divide both sides by two)
boys=16/2=x
now go back
girls=x+7=
if you chose
girls=x, then
boys=x-7
do the same process
you should get the same answers
2007-09-24 19:31:09 · answer #3 · answered by molawby 3 · 0⤊ 0⤋
let x=boys
so then x+7 =girls
you know you have 23 total so...
x +x+7=23
Subtract 7 on each side
x+x+7-7=23-7
Simplify
2x=16
divide each side by 2
x=8
so there are 8 boys
now remember x+7 was girls
8+7=15 girls
Check your answer
8 (boys) +15(girls) = 23 students
2007-09-24 19:22:36 · answer #4 · answered by Jessica 3 · 0⤊ 0⤋
8+15=23, 15-8=7
15 girls, 8 boys
2007-09-24 19:18:54 · answer #5 · answered by Jamie F 2 · 0⤊ 0⤋
here is how i got it
7-23=16
16/2=8
8-23=15
8-15=7
8 boys
15 girls
2007-09-24 19:19:16 · answer #6 · answered by tajme5 3 · 0⤊ 0⤋
if the number of girls = g and the number of boys = b
g = b + 7
and
g + b = 23
so b + 7 + b = 2b + 7 = 23
2b = 16
b = 8
g = 15
2007-09-24 19:22:21 · answer #7 · answered by Beardo 7 · 0⤊ 0⤋
what you do is like this:
x is the girls
y is the boys
x+y=23
x+7 is y
so you insert that: x+x+7
you now have 2x+7=23
subtract the 7 and you get 16.
Divide by 2 and you get x=8.
then you put 8 into x and you get y is 15.
2007-09-24 19:21:09 · answer #8 · answered by lamus_maser 2 · 0⤊ 0⤋
Let x equal the number of boys and (x+7) equal the number of girls........ x+(x+7)=23
You can handle it from here.
2007-09-24 19:20:07 · answer #9 · answered by slobberknocker_usa 7 · 0⤊ 0⤋
g=b+7
g+b=23
b+7+b=23
2b+7=23
2b=16
b=8
g=8+7=15
2007-09-24 19:23:12 · answer #10 · answered by Your Best Fiend 6 · 0⤊ 0⤋