Consider the following sequence of words: (Left) ACT BUS CAR DAD (Right) In each word, every vowel is changed to the letter immediately following it in the English alphabetical order, and every consonant is changed to the letter immediately preceding it. In how many of the letter clusters thus formed will no vowel appear?

Refer to the following letter, number, and symbol series and answer the question that follows. (NOTE: All numbers are single-digit numbers only.) (Left) H 2 @ Q I 3 L © £ R S 4 4 U © 9 1 W Y % 6 £ (Right) If all the symbols are dropped from the series, which element will be fifth from the left?

Which letter-number cluster will replace the question mark (?) in the given series to make it logically complete? AZA 27, XWX 36, UTU 45, RQR 54, ?