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You have to use the guess and check method
Solution:
Using guess and check,
5³-2³=125-8=117 ❌
5³-3³=125-27=98 ✔
Volume of cube B=3³=27cm³
Solution:
Using guess and check,
5³-2³=125-8=117 ❌
5³-3³=125-27=98 ✔
Volume of cube B=3³=27cm³
Sorry, my bads the last step should be
Capacity of container A=5³=125cm³
Capacity of container A=5³=125cm³