On dividing a number by $38$, we get $90$ as quotient and $19$ as remainder. What is the number?

Which of the following sequences is in descending order of their values?

$A$ number when divided by $44$, gives $432$ as quotient and $0$ as remainder. What will be the remainder when dividing the same number by $31$?

$5.6 \times 12.5 \div 0.5 + 15.5 = ? + 49.5$

$(\sqrt{2209}-12) \times 5 = ?$

If the digit in the unit's place of a two-digit number is halved and the digit in the ten's place is doubled,the number thus obtained is equal to the number obtained by interchanging the digits. Which of the following is definitely true?