21. Naira wants to repair a square table that has a perimeter of 200 cm. If one side of the table is damaged, how long is the side of the table that Erlan needs to repair ?
a. 10 cm b. 15 cm c. 50 cm d. 60 cm
22. Cheryl uses 385 one-centimetre cubes to make a cuboid. Each side of the cuboid is longer than 1 cm. The dimensions of the cuboid are . . . .
a. 3 cm × 5 cm × 7 cm b. 5 cm × 7 cm × 9 cm c. 3 cm × 5 cm × 11 cm d. 5 cm × 7 cm × 11 cm
23. The temperature in a refrigerator is -oC. When the power goes off, the temperature in the refrigerator rises 1oC every 10 minutes. Determine the temperature in the refrigerator if the power supply is off for 30 minutes
