SOLUTION: 3/5 of the pupils in a class are girls. There are 12 boys in the class. How many girls are in the class?

Question 826063: 3/5 of the pupils in a class are girls. There are 12 boys in the class. How many girls are in the class?
Found 2 solutions by josgarithmetic, stanbon:
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
b boys
g girls
c class size

; . . .
The last two equations are our system to solve.

SYSTEM:
-----------------

-----------------

-----------------

'

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
3/5 of the pupils in a class are girls. There are 12 boys in the class. How many girls are in the class?
-------------------
Let # in the class be "x";
(2/5)x = 12
x = (5/2)12
x = 30
======
# of girls = (3/5)30 = 18
------------------------------
Cheers,
Stan h.
============
RELATED QUESTIONS
The ratio of boys to girls in a class is 3:5.if there are 8 more girls than boys,how many (answered by 428225,Gogonati)
in a class the ratio of boys to girls is 3:2. If there are 11 more boys than girls,how... (answered by richwmiller)
In a class 60% of the pupils are boys. If there is 180 girls in the class how many pupils (answered by ewatrrr)
In a class of 25 pupils , 3/5 are boys. How many girls are there ? (answered by Alan3354,ikleyn)
In a class of 40 pupils, there are 24 boys and the rest are girls. How many percent more... (answered by Edwin McCravy)
The ratio of boys to girls in a class is 3:4.I f there are 42 pupils in class, how many... (answered by ikleyn)
� of a class are girls. 5 class members are boys. How many children are there in the... (answered by richwmiller,harpazo)
the ratio of boys to girls in an art class is 3:5 there are 12 boys in the class how many (answered by stanbon,ewatrrr,TimothyLamb)
47% of all pupils in a class are boys what percentage of the class are girls (answered by fractalier)