The cube

The cube has an edge of 12 dm. The second cube has an edge exactly 20% longer. How many % is more water in the second cube than in the first cube, if the first cube is full to 3/4 and the second to 3/8?

Correct result:

p =  -13.6 %


a1=12 dm a2=(1+20100) a1=(1+20100) 12=725=14.4 dm  V1=34 a13=34 123=1296 dm3 V2=38 a23=38 14.43=1119.744 dm3  p=100 V2V1V1=100 1119.74412961296=685=685%=13.6%

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