### Brain Teasers

# Big Number

Multiply by 7 the number of 8's immediately followed by 3, but not by 5, in the number below:

381654783298514285838385737983256941837408326

It looks a lot harder than it really is!

381654783298514285838385737983256941837408326

It looks a lot harder than it really is!

### Answer

Simply count the occurrences of 83There are 6 (six) 8's followed by 3

Now multiply it by 7

Hence the answer is 42.

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