To build a wall, worker A can complete it alone in 10 hours, and worker B can complete it alone in 11 hours. If the two work together, due to poor coordination, they lay 48 fewer bricks per hour. To finish the job as soon as possible, the boss still hired A and B to work together, and they completed the job in 6 hours. How many bricks does this wall consist of?
Engineering problem.
Assume the total work is 1;
The work efficiency of A is $1 \div 10=\frac{1}{10}$;
The work efficiency of B is $1 \div 11=\frac{1}{11}$;
The actual work efficiency of A and B together is $1 \div 6=\frac{1}{6}$;
Due to poor coordination, A and B complete $\frac{1}{10}+\frac{1}{11}-\frac{1}{6}=\frac{4}{165}$ less work per hour; this wall consists of $48 \div \frac{4}{165}=1980$ bricks.