Maths question

Let x be the number of seats in the stadium before the expansion.

x * (1 + 15%) = 41400

x * 1.15 = 41400

x = 36000

The number of seats in the stadium before the expansion is 36000.


2013-11-24 18:34:33 補充：
Let x be the number residents in the village last year.

x * (1 - 15%) = 1105

x * 0.85 = 1105

x = 1300

There were 1300 residents in the village last year.

let the number of seats in the stadium before the expansion be x, then,
100%x+15%x=41400
115%x=41400
x=41400/115%
x=41400X100/115
x=36000

2013-11-24 17:47:53 補充：
The number of seats in the stadium before the expansion is 36000