Question

_+_+_=30 we can use only (1,3,5,7,9,11,13,15) you can also repeat the number

Answer 1

it is impossible to get answer in even number by adding odd number. 
But it can doen by factorial method.
3! + 15 + 9 =30
3! + 11 + 13 = 30 
3! = 1*2*3 = 6

Answer 2

the some of odd no. is never be even .....for that u use it in standerd form