I need if this method is right

[short bison]

Hi I am doing a question of volume of cuboid and my friend did another method while I did my own and he answer is same tommorow is my math exam and I need help to see if my method will work

[short bison]

My friend method

My method

The answer is 4cm in both

[sly axle]

<@&776327020388679680>

[gusty bolt]

Both of you used the same method. Your friend just didn't substitute the values into the equation before solving it.

The solutions are both correct

[short bison]

Thx