You are given these numbers: 20, 100, 50, 10, 1. Which of these numbers is the smallest number that is ten times the sum of its digits?

Question

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Answer 1

The sum of the digits (in the same order) is 2, 1, 5, 1, 1.

Ten times these: 20, 10, 50, 10, 10. The smallest of these is 10 which is 10 times the sum of the digits of the fourth number (10).