Mother was asked how many gifts she had in the bag. She replied that there were all dolls but six, all cars but six, and all books but six. How many gifts had she in all?
9
Let total gift are x.
i.e. dolls are = x – 6
cars are = x – 6
books are = x – 6.
i.e. x = 3 (x – 6)
x = 3x – 18
18 = 2x
x = 9