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Class X has 50% more students than Class Y. Class X has 40% fewer students than Class Z. Given that there are 80 students in the 3 classes, how many students are there in Class X?

 Jun 10, 2021
 #1
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x=3y/2 x=3z/5 z=15y/6=5y/2

y+3y/2+5y/2=10y/2=5y y=16

x=24 z=40

40+24+16=80

x=24

 Jun 10, 2021
 #2
avatar+35061 
+2

x = 1.5 y     or    y = 2/3 x

x = .6z        or    z = 1 2/3 x

x                                                       summed, the red equations = 80

 

2/3 x + 1 2/3 x   + x = 80

3 1/3 x = 80

x = 24 sudents

 Jun 10, 2021
edited by ElectricPavlov  Jun 10, 2021

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