Traditional Culture Encyclopedia - Photography and portraiture - When the length of a cuboid is increased by 2 cm, it becomes a cube, and its volume is increased by 50 cubic cm. At this time, the volume of this cube is () cubic centimeters?
When the length of a cuboid is increased by 2 cm, it becomes a cube, and its volume is increased by 50 cubic cm. At this time, the volume of this cube is () cubic centimeters?
2. The school needs to paint the classroom. It is estimated that * * * needs 224 kilograms of paint and 35 kilograms of paint per barrel. At least (224÷35=7) barrels should be bought.
3, 3 minutes to process 15 parts, 2 parts need (2/5) minutes, 2 minutes to process (10) parts.
4. The photography team took photos for the first batch of students. The cost of three photos of a negative is 2.70 yuan, and the cost of printing one photo is 0.40 yuan. The first team has 15 students. If every student has a photo, then every student has to deal with (2.7+4.8)÷ 15=0.5 yuan.
5. There are 100 balls in the pocket, including 42 red balls, 20 green balls, 20 white balls 14 and 9 black balls. The possibility of taking out the white ball (14%) and the possibility of taking out the black ball (9%).
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