Sandra took a 20-gram ice cube out of her freezer. She put the ice cube in a cup and covered the cup with a lid. She left the cup at room temperature for an hour.
When Sandra came back, she saw that there had been a change. The cup had both water and ice in it. There were 10 grams of ice and 10 grams of water.
Look at the graph and answer the question below.
Complete the following sentences.
Before the change, the mass of the ice was
grams. After the change, the total mass of the ice and water was
grams.