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The preposition "about" correctly follows "concerned" to indicate the topic of concern.
110, 119, ?, 193, 274, 395
[(145)² ÷ 25 × 52] ÷ ? = 29 × 13
600 60 12 ? 1.44 0.72
23 40 67 104 ? 208
...840, 2520, 630, 3150, ?, 3675
15.5, 62, 186, ?, 2232, 8928
5, 5, 15, 75, ?, 4725
Complete the series choosing the missing number.
110, 99, 86, ___, 54, 35.
82, 98, 130, 178, 242, ?
10296/72 + 3040 = (? × 4) + 1395
