self Maths Puzzle

The edges of three iron cubes are 6 cm; 8cm; 10 cm respectively. A new cube was made by melting them. Find the edge of the new cube ?

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self Other Question

Arjun can complete 1/4th of a work in 10 days. Then Raj joins him and both of them complete the work together in 8 days. In how many days Raj alone finishes the work? Find the length of the wire required to go 15 times round a square field containing ?