### Brain Teasers

# Number Unknown

There is a number, the second digit of which is smaller than the first digit by 4 and if the number is divided by the digit's sum, the quotient would be 7. Find the number.

### Answer

The number is 84.Hide Answer Show Answer

## What Next?

View a Similar Brain Teaser...

If you become a registered user you can vote on this brain teaser, keep track of which ones you have seen, and even make your own.

### Solve a Puzzle

## Comments

That's an interesting puzzle. Every third (2 digit) multiple of 7 gives the answer 7 when divided by the sum of its digits! Wow!

That's really no so amazing Jimbo if you look at it as multiplying 21 by a number that multiplies both 21 and its digits until you overflow the digit multiplication.

Every third multiple of 67 up to 1000 produces 67 when divided by the sum of its digits!

Every third multiple of 667 up to 10000 produces 667 when divided by the sum of its digits!

Every third multiple of 67 up to 1000 produces 67 when divided by the sum of its digits!

Every third multiple of 667 up to 10000 produces 667 when divided by the sum of its digits!

To post a comment, please create an account and sign in.

## Follow Braingle!