self Maths Puzzle

2+3+4=15
3+4+5=48
4+5+6= ?

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self Other Question

The average of a number,its square and its cube is two more than the fourteen times the number.
Find the number?
An orchestra contains 14 violins and 34 flutes. Manish wants to arrange the two types of instruments into the same number of rows. What is the greatest number of rows in which he can arrange the violins and the flutes?