brain teaser

Level 2

When the monkey rotate the gear, which mark will be hit 1 or 2 ?

none 1 2 not enough information

Jaber Al-arbash by Jaber Al-arbash , 28, USA

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1 solution

Jaber Al-arbash
Oct 6, 2014

I think the easiest way to solve this is to count how many gears there are. In this example there are 17 gears. So every odd numbers that is ( 3rd,5th,7th,....17th gear) will rotate in the same direction as the first gear and all the even numbers that is( 2nd,4th,6th,....16th) will rotate in the opposite direction. For example, the 1st gear is an odd number and the last gear = 17th is also an odd number.Therefore, they rotate in the same direction thus it is (2)

2 Helpful 0 Interesting 0 Brilliant 0 Confused

You're absolutely right, but you also have to consider the belt arrangements of the unmeshed gears. For example, if you uncross the belts that drive gears 6 and 7, even though you have an odd number of gears, the arrow will hit number 1. In this case, there are two crossed and two uncrossed belts so they cancel each other out and you're reasoning happens to be right.

Ia Nick - 6 years, 5 months ago

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