perplexus.info :: Just Math : Divisibility and Twenty Puzzle

Divisibility and Twenty Puzzle (Posted on 2015-10-17)

N is a positive integer having at most 4-digits. Determine the total number of values of N such that:
N is divisible by 7, and:
The sum of the digits of N is equal to 20.

Submitted by K Sengupta

Rating: 5.0000 (1 votes)

Solution: (Hide)

There are precisely 90 values of N that satisfythe given conditions.
Dej Mar has listed all these 90 values, wihout proof, in this location.

Comments: ( You must be logged in to post comments.)

	Subject	Author	Date
	answer	Dej Mar	2015-10-17 18:05:43

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