Question

when 4131 people attended a concert, the concert hall was 90% full. How many seats does the concert hall have ?

Answer 1

4590

Answer 2

capacity * 0.9 = 4131

so

capacity = 4131 / 0.9 = ...

Answer 3

4131= X*0.9 hence x= 4131/.9=4590

Answer 4

Make a proportion:
\[\frac{ 4131 }{ x }=\frac{ 9 }{ 10 }\]