100 Doors 2013 Level 40 Walkthrough

1. First, press on each clock until it makes a full circle to see how many clicks it takes to make a full circle.
You'll find the following:
Top left = 7 clicks
Top right = 9 clicks (iOS version is 10 clicks)
Bottom left = 10 clicks (iOS version is 9 clicks)
Bottom right = 8 clicks

Now solve the division problems on the left side of the door:
24/3 = 8
27/3 = 9
30/3 = 10
21/3 = 7

Now match each clock with a division problem and the number that it points to:
Top left = 7 clicks = 21/3 --> 2
Top right = 9 clicks = 27/3 --> 4
Bottom left = 10 clicks = 30/3 --> 6
Bottom right = 8 clicks = 24/3 --> 3

Finally, press each clock the number of times that it's division problem points to.
Top left = 2 times
Top right = 4 times (iOS version is 6 times)
Bottom left = 6 times (iOS version is 4 times)
Bottom right = 3 times

2. Proceed to the next level!

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