Steamed rice can't save 20 minutes, and the rest can be done in 20 minutes no matter how arranged.

Arrangement: 1, steamed rice, 2, wiping the table, 3, washing towels, 4, mopping the floor with water after washing towels, 5, mopping the floor with water and watering the flowers (not too dirty, just watering the flowers in the garden; If it is a flower in an indoor pot, wash it with a towel. This is done to save water. )

2. Take A as the arc center, and use compasses to make an arc intersection point on both sides of point A on the straight line; Make two intersecting arcs in the middle of the diameter with the two intersections of arcs and straight lines on both sides as the center; Connect two intersections of two arcs with a straight line. The last straight line is a vertical line, just passing through point A.