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`The number of 1-bedroom apartmenst is twice the number of 2-bedroom apartments`
means
x = 2y

`An apartment complex contains 230 apartments each having 1, 2 or 3 bedrooms`
so
x+y+z = 230

Do you see how to solve?

Honestly i dont...

Its the only one i cant seem to get

x+y+z = 230
6z+20+y+z = 230 ... replace x with 6z+20
6z+20+3z+10+z = 230 ... replace y with 3z+10

now solve `6z+20+3z+10+z = 230` for z

omg thanks brother
You helped me out a lot today

no problem