what number should replace the question mark ? 10 , 30 , 14 , 25 , 18 , 20 , - - - ?
"answer : d 10 , 30 , 14 , 25 , 18 , 20 , 22 ? there are two alternate sequences : + 4 and - 5 ."
add(add(add(const_2.0, 10), 10), 10)