correction to question 16

Author: HassanOHOsman

number-systems/README.md

@@ -50,7 +50,7 @@ Convert the hex number B to decimal.
 Answer: 11
 
 If reading the byte 0x21 as a number, what decimal number would it mean?
-Answer: 528
+Answer: 33
 
 If reading the byte 0x21 as an ASCII character, what character would it mean?
 Answer: !