Fraction of spectators covered \(=\frac{2}{7}\)
Fraction left \(=1-\frac{2}{7}=\frac{7-2}{7}=\frac{5}{7}\)
Number of spectators in open = 15000
According to the question,
Number of spectators in open = Total number of spectators x \(\frac{5}{7}\)
\(\Rightarrow\) \(15000 =\frac{5}{7}\times\) Total number of spectaors
\(\Rightarrow\) Total number of spectators \(=15000\div\frac{5}{7}\)
\(\Rightarrow\) Total number of spectators \(=15000\times\frac{7}{5}\)
\(\Rightarrow\) Total number of spectators \(=21000\)