THE WATER LEVEL IN A RESERVOIR IS LOW BUT DOUBLES EVERY DAY IT TAKES 60 DAYS TO FILL THE RESERVOIR HOW LONG DOES IT TAKE FOR THE RESERVOIR TO BECOME HALF WAY FULL RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

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Round As A Dishpan Deep As A Tub Riddle

Hint:
A sieve.
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Prince Age Riddle

Hint:
Current Future Past

Princess x 2z (x+y)/2
Prince y x z

I then created three equations, since the difference in their age will always be the same.

d = the difference in ages

x y = d
2z x = d
x/2 + y/2 z = d

I then created a matrix and solved it using row reduction.

x y z

1 -1 0 d
-1 0 2 d
.5 .5 -1 d

It reduced to:

x y z

1 0 0 4d
0 1 0 3d
0 0 1 5d/2

This means that you can pick any difference you want (an even one presumably because you want integer ages).

Princess age: 4d
Prince age: 3d

Ages that work

Princess:
4
8
16
24
32
40
48
56
64
72
80

Prince:
3
6
12
18
24
30
36
42
48
54
60
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10 Cookies Riddle

Hint:
She hands the 10th child the jar with one cookie left in it.
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Sinking Ship Riddle

Hint:
It was a Submarine.
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Crossing The Equator

Hint:
Susy can fill the sink and watch it drain. When the water reverses direction when going down the drain, she will know they have crossed the equator.
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Single Ship Riddle

Hint:
They are all married.
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Cruise Ship Riddle

Hint:
The 3rd person is the "night" (knight)
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On The Deck Of A Ship

Hint:
Stop imagining!
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Fired Missiles

Hint:
They flew into each other.
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Cannot Be Seen

Hint:
A blink of an eye.
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Covered With Three Layers Riddle

Hint:
A cats eye.
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Wash Here Daily

Hint:
Bathroom
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Coming Out At Night

Hint:
Stars
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Jumping Duck Riddle

Hint:
Because ducks can't read.
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Keep 'em Chilled

Hint:
Refrigerator
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