Question

in an opera theater, sections of seating consisting of three rows are being laid out. It is planned so each row will be two more seats than the one before it and 90 people must be seated in each section.How many people will be in the third row?

Answer 1

1st row=x

2nd row=x+2

3rd row=x+2+2

`(x)+(x+2)+(x+2+2)=90`
`3x+6=90`
`3x=90-6`
`x=(84)/(3)=28`

1st row=x=28

2nd row=x+2=28+2=30

3rd row=x+2+2=28+2+2=32