

<p class="comment">Lots of clever detectives here! Well done Steven Horner, age 13, Forres Academy; Soh Yong Sheng, age 13, Raffles Institution; Fiona Watson, Y10, Stamford High School; Julian Stirling, Helen Adams, Ben Morrison Hethersett High School; Anne Lake, Peter Goddard, Becky Gray, Darren Reynolds, Y7 Bourne Grammar School; Scott Reynolds, Sam Clark, age 12, St Peter&#39;s College, Adelaide, South Australia; Ren Papilion; James Bollard; Tim Weir, age 13, Madras College; Daniel Watson and Mike Taylor Brown, Y9, King Edward VI School, Bury St Edmunds; Dilara Ilter, Ece Oney age 12,IRMAK Primary School,Turkey.</p>
<p>These are the statements:
<br />Alice: I know who killed her
<br />Ben: I killed her
<br />Carol: Ben killed her
<br />Donald: It wasn&#39;t Ben or Carol.</p>
<p class="comment">This is Ben Morrison&#39;s solution.</p>
<u>Case 1: Everyone is lying</u>
<p>Carol did it because Donald said that Ben and Carol didn&#39;t do it so that meant that either Ben or Carol was a murderer. Ben said he killed her and he was lying so that meant Carol killed her! (Alice said I know who killed her and that meant she did not know).</p>
<p>
<u>Case 2: Just one person lies</u> Ben did it and Donald was telling a lie. Carol said Ben killed her and she was telling the truth. Alice didn&#39;t actually say that Ben killed her, but she said I know who killed her which did not mean a particular person.</p>