Puzzle 109
Last week, I travelled from Birmingham to Glasgow, the long way round (on a bicycle!).
On day one, I travelled one quarter of the distance.
On day two, I travelled one half of the remaining distance.
On day three, I travelled three quarters of the remaining distance.
Yesterday I travelled one third of the remaining distance.
I now have 21 miles left to travel.
How far is it from Birmingham to Glasgow in total?
Puzzle Copyright © Kevin Stone
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Hint
How many miles were left at the start of yesterday?
Answer
336 miles.
Reasoning
To work these numbers out, it is perhaps easier to start at the end and work backwards.
Yesterday I travelled 1 /3 of the distance to leave 21 miles, therefore there were 31.5 miles (=21 ÷ 2 /3 ) at the start of yesterday.
On day 3 I travelled 3 /4 of the distance to leave 31.5 miles, therefore there were 126 miles (=31.5 ÷ 1 /4 ) at the start of day 3.
On day 2 I travelled 1 /2 of the distance to leave 126 miles, therefore there were 252 miles (=126 ÷ 1 /2 ) at the start of day 2.
On day 1, I travelled 1 /4 of the distance to leave 252 miles, therefore there were 336 miles (=252 ÷ 3 /4 ) at the start of day 1.
Double-Checking
On day one, I travelled one quarter of the distance (84, leaving 252).
On day two, I travelled one half of the remaining distance (126, leaving 126).
On day three, I travelled three quarters of the remaining distance (94.5, leaving 31.5).
Yesterday I travelled one third of the remaining distance (10.5).
I now have 21 miles left to travel.
Puzzle 110
What letter comes next in this sequence:
J · F · M · A · M · J · J · ?
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Hint
This is a very common sequence.
Answer
A.
August, from initial letters of the months of the year.
Puzzle 111
Can you find every occurrence of the word SEPTEMBER that appears in this grid (horizontally, vertically, or diagonally)?
The hint will reveal the number of times it occurs, but where are they?
Note: this puzzle is not interactive, and the letters cannot be selected.
Puzzle Copyright © Kevin Stone
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Hint
The word SEPTEMBER appears 17 times.
Answer
The word SEPTEMBER appears 17 times.
Puzzle 112
During a recent expedition, three intrepid adventurers were left stranded in the middle of the desert with only a crate full of apples.
During the night, Alex woke up and decided to hide some of the apples and hid a third, then promptly fell asleep again.
Billie woke up shortly after and also decided to hide a third of the remaining apples and then also dozed back to sleep.
Finally, Charlie woke up and seeing the others were asleep, took a third of what was left.
Of course, none of the adventurers knew of the other's antics, so, in the morning, they shared the remaining apples, each receiving sixteen. How many apples were in the crate originally?
Puzzle Copyright © Kevin Stone
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Hint
How many apples were left after Charlie had taken some?
Answer
162 apples.
Alex hid 54, leaving 108.
Billie then hid 36, leaving 72.
Charlie then hid 24, leaving 48 available to share in the morning.
Reasoning
To work these numbers out, we start at the end and work backwards.
At the end there were 16 apples each, therefore there were 48 apples in total.
Charlie removed one third, leaving 48, so there must have been 72 apples before.
Billie removed one third, leaving 72, so there must have been 108 apples before.
Alex removed one third, leaving 108, so there must have been 162 apples before.
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