SOLUTION: Jeremy has a fish tank that has a 40-cm by 70-cm rectangular base. The water is 25 cm deep. When he drops rocks into the tank, the water goes up by 2 cm. What is the volume in l

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Question 193535This question is from textbook A Problem Solving Approach to Mathematics, for Elementary School Teachers
: Jeremy has a fish tank that has a 40-cm by 70-cm rectangular
base. The water is 25 cm deep. When he drops rocks
into the tank, the water goes up by 2 cm. What is the volume
in liters of the rocks?
It seems to me this is measuring by water displacement, but I do not understand how to go about solving this problem. Thank you. This question is from textbook A Problem Solving Approach to Mathematics, for Elementary School Teachers

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Jeremy has a fish tank that has a 40-cm by 70-cm rectangular
base. The water is 25 cm deep. When he drops rocks
into the tank, the water goes up by 2 cm. What is the volume
in liters of the rocks?
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The volume of the rocks is 40 by 70 by 2 cms. The depth of the water is irrelevant.
40*70*2 = 5600 cc, or 5.6 liters