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Puzzle 17 


Which is greater, the number of grooves on one side of a vinyl record (if you can remember them!) or the number of days in the year?

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Puzzle 18 


Complete this grid with the digits 1 to 6 to make the sum correct.

Perform each mathematical operation in the order shown, from left to right, so 1 + 2 x 3 is treated as (1 + 2) x 3 = 9.

Consecutive numbers are not next to each other, there is no ÷ 1, and at no point is a decimal or a fraction used.

?+?-?x?/?x?=50

Note: this puzzle is not interactive, and the squares cannot be clicked.

Puzzle Copyright © Kevin Stone

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Puzzle 19 


I was recently given a new watch for my birthday.

However, as usual with my presents, it was quite useless as it loses 6 minutes every hour.

I set it using my friend's accurate watch at midnight, and it now shows 10:39am.

I know that the watch stopped 21 minutes ago, so what is the correct time now?

Puzzle Copyright © Kevin Stone

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Puzzle 20 


Tommy: "How old are you, mamma?"

Mamma: "Let me think, Tommy. Well, our three ages add up to exactly seventy years."

Tommy: "That's a lot, isn't it? And how old are you, papa?"

Papa: "Just six times as old as you, my son."

Tommy: "Shall I ever be half as old as you, papa?"

Papa: "Yes, Tommy; and when that happens our three ages will add up to exactly twice as much as to-day."

Tommy: "And supposing I was born before you, papa; and supposing mamma had forgot all about it, and hadn't been at home when I came; and supposing--"

Mamma: "Supposing, Tommy, we talk about bed. Come along, darling. You'll have a headache."

Now, if Tommy had been some years older he might have calculated the exact ages of his parents from the information they had given him. Can you find out the exact age of mamma?

Mamma's Age, Amusements In Mathematics, Henry Ernest Dudeney.

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