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The answer on page 40 of the math classroom exercise book in the second volume of the sixth grade
At the beginning, the water depth was 1/2, and after being put into the cone, the water depth was 3/5-1/2 =110.

Flood height:15×110 =1.5cm.

Bottom area: 3. 14×(8÷2)? =3. 14× 16=50.24 cm2.

Volume of the cone: 50.24× 1.5=75.36 cubic centimeters.

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