perplexus.info :: Numbers : One problem

One problem - many ways to solve... (Posted on 2017-12-21)

The problem below (Moscow Puzzles #313) can be solved in more than 4 ways,
(each d1 by itself) - using different approaches.

Find the number t and the digit represented by k in:
[3*(230+t)]^2=492,k04

List your ways of solving it.

No Solution Yet Submitted by Ady TZIDON

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Simplest way to determine k

| Comment 2 of 6 |

Mod 9, the LHS (Left Hand Side) = 0 (because it involves 3^2).

So, the RHS sum of digits must be a multiple of 9.

So k must = 8.

Posted by Steve Herman on 2017-12-21 10:38:32

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