There are 40 students in the school play . if there are 3 times as many girls as boys on the play how many girls and how many boys are there in the play

here is ur answer. ...

H there!!

Total no. of students in play= 40
Boys in the play=x
Girls in the play= 3x
The equation formed,
3x+x=40
4x= 40
x= 40/4= 10
No. of boys = 10
No. of girls= 3*10=30

Hope its right

Let boys be X
girls=3x
X+3x=40
4x=40
X=40/4=10
therefore, boys=10 & girls=30

You asking the question.
 
you should also give the options that will be but still here is the answer.
first of all you should check  quadratic to know the area of rectangular so that it can be factorized easily.
as we know that area of rectangular is given by using  length and width( product of both) k2+19k+0 = (k+4)(k+15) 
where k + 15 mean length of rectangular k+4 means width of rectangular.
so width of rectangular is = k+ 4
length of rectangular is = k+15.
i hope will you.

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sorry

vry long answer