This was a Medium puzzle with all operations.
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Category Archives: brain teaser
March 2022 Brain Puzzler Solution
A: 454585
The first two digits are the product of 9 x 5
The third and 4th digits are the product of 9 x (the other 5)
The 5th and 6th digits are 45 + 45 – middle digit = 90 – 5 = 85
February 2022 Brain Puzzler Solution
Q: You are painting a square wall that is 12 feet by 12 feet.
When you are halfway done, the unpainted part of the wall is still a square that measures 12 feet from top to bottom by 12 feet from side to side. How is this possible?
A: A: It’s a square within a square. The unpainted square is nested within the larger square like this:
December 2021 Brain Puzzler Solution
Q: Start with 100 coins: 10 stacks of 10 coins each.In 9 of the stacks, the coins all weigh 1 ounce but one stack has coins that weigh 2 ounces. Using only a digital scale and only one weighing, identify the stack that contains the 2-ounce coins.
A: Number the stacks from 1 to 10.
Then represent each stack with its number of coins so Stack 1 will have 1 coin and Stack 2 will have 2 coins, etc.
These 10 stacks if all the coins weighed the same would be 55 ounces
(1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10).
The difference between the actual weight and 55 would tell us which stack had the 2-ounce coins .
For example. if stack 5 was the stack with the 2-ounce coins, the weight would have been 60 (55+5).
November 2021 Brain Puzzler Solution
Q: At 5 o’clock, it takes 5 seconds to strike 5 chimes on a chime clock. Assuming the chime takes negligible time, how long will 12 chimes take at 12:00?
A: 13.75 seconds
The total time is 5 seconds and there are 4 intervals between the chimes so each interval is 1.25 seconds.
At 12:00, there are 11 intervals between the chimes, therefore the chimes will take 11 x 1.25 seconds = 13.75 seconds.
Math Confidence by Robin the Math Lady 