Track / Stage 4 / 135 of 340 #395 of 1964

Write down all three-digit numbers whose sum of digits is equal to 4.

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A number or a short expression. Spacing, $ signs and \frac vs / are all fine.

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Official solution

Solution. Three-digit numbers whose sum of digits is equal to 4 are: 400, $310, 301, 130, 103, 220, 202, 211, 121$ and 112.

Source: NuminaMath-1.5, licensed Apache-2.0. Statement and solution reproduced as published; topic, difficulty and ordering added by this site.