Question

three solid iron cubes of edges 4cm 5cm and 6cm are melted together to make a new cube 62cm of the melted material is lost due to improper handing the area in cm the whole surface of the newly formed cube is what​

Answer 1

volume of all three cubes combined is

4^3 + 5^3 + 6^3

64 + 125+ 216 = 405

but 62 cm cube vol is lost

therefore volume of new cube is 343 cm cube

let side of new cube is a

a*a*a = 343

a=7

surface area = 6*a*a

6*7*7 = 294 cm square