C
The digits add up to 19. In all the others the total is 18.

6
The series is spaced incorrectly. When the spacing is correct it becomes: 2 4 8 16 32 64 128 256, which is an obvious doubling-up series.

Her mouth

The person who asks the question

10%

70
75
85
+ 80
310 ÷ 3 = 100 remainder 10

A is false (the angle is 165 degrees of 195 degrees)
B is true
C is true
D is true (AEFHIKLMNTVWXYZ)

A. FALSE, B. TRUE, C. TRUE, D. FALSE
Canberra is the capital of Australia; Gauguin was a French post-impressionist painter.

The letter "M"

27, put them beside each other

Sixty

59
The first 56 balls could be of all colours except red. This would leave 8 balls, all of which are red, so any three chosen would be red.

Three sisters and two brothers
This can be solved by simple deduction, but if algebra is used let x be the number of sisters and
y the number of brothers:
x+ 1= 2y
y+ 1= x
Therefore, y + 1+ 1= 2y
so y =2
or x + 1= 2x - 2
so x = 3