Proctele apps in the App Store

Proctele apps in the App Store
Click the picture to see Proctele apps in Apple's App Store

Friday, February 4, 2011

Answer to the difficult 969

The question was: How do you add, subtract, multiply and divide 3, 5, 7, 9, 75, 100 to get 969 ?

It's interesting to note that 969 = 323 x 3, so a first approach is to try to get to 323 using 5, 7, 9, 75, 100. That turns out to be possible: (75 - 9) x 5 - 7 = 323.

Answer: 969 = ((75 - 9) x 5 - 7) x 3 = (66 x 5 - 7) x 3 = (330 - 7) x 3 = 323 x 3.

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