If the following stack of blocks looks the same from back and front directions, what is the number of blocks that are used to build it?
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Answer:
70
Friday, January 27, 2012
Saturday, January 21, 2012
Pulleys Puzzle
In the following figure, the diameter of pulley P1 is twice that of pulley P2, as the diameter of pulley P3 is twice that of pulley P4. If pulley P3 rotates 15 times, how many times will pulley P1 rotate?
Scroll down to see the answer!
Scroll down to see the answer!
Answer: 8 times.
Pulley P4 rotates 30 times; while its pinion with 8 teeth rotates 30 times too (30 * 8 = 240 teeth-based rotations). The pinion of pulley P2 has 15 teeth; so it rotates 240 / 15 = 16 times that makes pulley P1 rotate 8 times!
Pinion Puzzle [Easy 1]
If pinion A rotates six times how many times will pinion C rotate?
Answer:
10.
A has 20 teeth and B has 10. So B rotates 12 times. As C has 12 teeth, B has 10 teeth, and B rotates 12 times, C will rotate 10 times: 12 * 10 = 10 * 12.
Or, simply:
6 * 20 = 120
120 / 12 = 10
Scroll down to see the answer!
Answer:
A has 20 teeth and B has 10. So B rotates 12 times. As C has 12 teeth, B has 10 teeth, and B rotates 12 times, C will rotate 10 times: 12 * 10 = 10 * 12.
Or, simply:
6 * 20 = 120
120 / 12 = 10
Friday, January 20, 2012
Visual Memory Test
In the following figure, there are 10 letters connected by pieces of lines. Study this figure for 2 minutes to remember what pairs of letters are connected to each other:
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Three connections are removed from the above figure and the remaining ones are depicted as in the following:
Can you remember the connections of which pairs of letters are removed?
Answer:
Monday, January 16, 2012
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