Three mad painters started painting the floor each in their own color. One managed to paint 75% of the floor red, another 70% green, and the third 65% blue. What part of the floor is definitely painted with all three colors?
Evaluation. 25% of the floor is not painted red, 30% of the floor is not painted green, and 35% of the floor is not painted blue.

25+30+35=90. From this, it follows that at least 10% of the floor is painted with all three colors.

An example where exactly 10% is painted with all three colors is clear from the evaluation: 25% of the floor is painted in two colors: blue and green, 30% - in red and green, 35% - in red and blue.

## Answer

10%.