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Question

There were 5 rows of chairs in the hall. Each row has 4 more chairs than the row in front of it. There was a total of 175 chairs. How many chairs were there in the first row?
How to do?
Tks

Answer

1st row: y chairs

2nd row: y + 4 chairs

3rd row: y + 8 chairs

4th row: y + 12 chairs

5th row: y + 16 chairs

y + y + 4 + y + 8 + y + 12 + y + 16 = 175

5y + 40 = 175

5y = 135

y = 27//

 

0 Replies 2 Likes ✔Accepted Answer

let look at the rows of chairs. if each row has 4 more chairs than the row in front of it. mean that we had to plus 4 to back work.

1| 1u

2|1u+4

3|1u+4+4

4|1u+4+4+4

5|1u+4+4+4+4

=175-(10*4) =135

135/5=27 is to find the first row of chair

(I am not good at English, so I am not sure if I am correct :p)

0 Replies 2 Likes