[OK] Privacy Policy  -  Terms & Conditions  -  See DetailsWe use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners who may combine it with other information you've provided to them or they've collected from your use of their services.

Puzzle Details

A grandfather and his grandson have the same birthday date.

For six consecutive birthdays the grandfather was a multiple of the grandson's age.

How old were each at the sixth of these birthdays?

[Ref: ZGSR]

Grandfather   Grandson
61            1      (61 = 1 x 61)

62            2      (62 = 2 x 31)

63            3      (63 = 3 x 21)

64            4      (64 = 4 x 16)

65            5      (65 = 5 x 13)

66            6      (66 = 6 x 11)

So on the sixth birthday, they are 66 and 6 respectively.

Our Favourite Illusions

 Shadow Illusion Are the squares A and B the same colour? Spinning Dancer Which way is the dancer spinning? Impossible Waterfall? Is the water flowing uphill in this impossible Escher type waterfall? The Butterfly A colourful butterfly?
 Duck Or Rabbit? Is this a duck or a rabbit? Hidden Faces Can you find his three daughters as well? Blind Spot An amazing demonstration of your blind spot. Impossible Prongs? Impossible prongs?
 What Am I? Can you tell what this is a picture of? Who Turned To? Who is missing? Same Eyes? Are her eyes the same colour? Parallel Cafe Wall Lines? Are the horizontal lines parallel?