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text/en/chapters/data-representation.md

@@ -426,7 +426,7 @@ It is really useful to know roughly how many bits you will need to represent a c
 {panel type="spoiler" summary="Answers for above challenge"}
 1. b (actually, 3 bits is enough as it gives 8 values, but amounts that fit evenly into 8-bit bytes are easier to work with)
 2. c (32 bits is slightly too small, so you will need 64 bits)
-3. c (This is a challenging question, but one a database designer would have to think about. There's about 94,000 km of roads in NZ, so if the average length of a road was 1km, there would be too many roads for 16 bits. Either way, 32 bits would be a safe bet.)
+3. b (This is a challenging question, but one a database designer would have to think about. There's about 94,000 km of roads in NZ, so if the average length of a road was 1km, there would be too many roads for 16 bits. Either way, 32 bits would be a safe bet.)
 4. d (Even 64 bits is not enough, but 128 bits is plenty! Remember that 128 bits isn't twice the range of 64 bits.)
 {panel end}