Domino Tiles

A domino tile is a rectangle composed of two squares, with each square marked with dots.
The number of dots on each square can be from 0 to 6, and each pair of numbers appears exactly once (regardless of order).
In total, there are 28 tiles in the game. How many dots are there on these tiles in total?

Difficulty level (1 very easy - 10 very hard): 1

Arithmetic Combinatorics

Sources:

Young Mathematician Olympiad, 2019-2020, Stage B, Grades 3-4 Question 3

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