Rithvik's Blog 11+

A chest is locked with a 5-digit code. The clues to the code are as follows: The first digit is a prime number. The second digit is twice the first. The third digit is the smallest odd number. The fourth digit is the difference between the third and first digit. The last digit is the sum of the first and fourth digit. What is the code to unlock the chest?

A secret code uses numbers where each digit corresponds to a letter: 1=A, 2=B, 3=C, and so on up to 26=Z. A particular code is a sequence of four numbers: 14, 15, ?, 20. The missing number corresponds to a letter that completes the pattern. What is the missing number and what letter does it represent?