Test site: fan-shaped statistical chart; The practical application of percentage; Get information from statistical charts.

Special topic: fractional percentage application problem.

Analysis: According to the fan-shaped statistical chart, the area of glass accounts for 20% of the total area, and the total area is 80 square meters, so the area of glass is calculated by multiplication formula; As can be seen from the bar chart, the workload of cleaning glass per minute for each person is 1/4. Use the multiplication formula to calculate the area of cleaning glass per minute for each person, and then calculate the area of cleaning glass per minute for 16 people. Finally, according to the workload ÷ working efficiency = working time, the time for 16 people to clean all the glass is calculated.

Solution: 80× 20% ↓ (80× 20 %× (1/4 )×16)?

= 16÷( 16×4),

=0.25 (minutes),

Answer: 16 It takes 0.25 minutes for people to clean all the glass.