254
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x < 35 + 35 + 15x < 85x > 40 x 2x > 80Therefore x is between 81 to 84 (inclusive).The only number in this range in which the digits sum to 9 is 81.
the sum for 20 + 40 + 70 + 80 = 210
20+35+40+55+60+55+80=345
The sum of these numbers is 563.
40