What terms will fill in the blank spaces?
$Y, W, U, S, Q, (...), (...)$

Second and third digits of each number given below are interchanged. Then,the $1st$ and the last digits of each new number thus formed are interchanged. Which of the following numbers then will be the highest number among the five?
$273, 372, 438, 184, 526$

Which number would replace the question mark in the series $2, 7, 14, 23, ?, 47$?

In the set of three-digit numbers given below,the first two digits of each number are interchanged. Which one among them will be in the middle if they are arranged in ascending order after the change?
$230, 422, 328, 516, 138$

Fill in the blank space for the given series with the correct alternative.
$3, 10, 20, 33, 49, 68, (\ldots)$

If the digits in the number $5, 7, 3, 4, 6, 2, 9$ are arranged in ascending order from left to right,how many digits will remain at the same position?