This is impossible as we know that odd no.+ odd no. = even no.
?+?+?+?+? = 30
hence, upto 4 blanks the sum formed will be even.
even no. + ? =even no.(30 is even no.)
? = even no. - even no.
hence, one even no. is required.to fill the blanks
but we require all the odd no.s
hence question is incorrect