Fifteen movie theatres average 600 customers per theatre day. If six of the theatres close down but the total theatre attendance stays the same , then the average daily attendance per the remaining theatres is.
A. 900
B. 1000
C. 1100
D. 1200
Answer: Option B
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$\begin{array}{l}\text{Total No. customers}\\
\text{ = 15 × 600 = 9000}\\
\text{Now,}\\
\text{present working theateres}\\
\text{= 15 – 6 = 9}\\
\text{Required average}\\
=\Large\frac{9000}{9}\\
=1000\end{array}$