16. Aimee says Bella is lying. Bella says Marc is lying. Marc says Bella is lying. Terry says Aimee is lying. How many of the four children are lying?
A 0
B 1
C 2
D 3
E 4
Solution
C

First, assume Aimee is telling the truth. Then Bella is lying, Marc is telling the truth and Terry is lying.
Second, assume Aimee is lying. Then Bella is telling the truth, Marc is lying and Terry is telling the truth.
Although it is impossible to tell precisely who is lying from the information given, in each case two children are lying.