A measuring cylinder containing 280 ml of water. After placing a glass marble, the water surface rises to 300 ml. the volume of this glass marble is______ .

A measuring cylinder containing 280 ml of water. After placing a glass marble, the water surface rises to 300 ml. the volume of this glass marble is______ .

300-280 = 20 (ML), 20 ml = 20 cubic centimeter; answer: the volume of this glass marble is 20 cubic centimeter