People with 80-90 points account for 1.
The number of people below 70 points accounts for 1.
0 in 65438+7. So it can only be a multiple of 7.
2 1,28,35,42,49,56
1, which is a multiple of 7.
2 1,,42,
1 is a multiple of 2.
So it can only be 42 people.
Then the score below 70 is 42* 1/3 = 14.
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