40 30 20 ? 7.5 4.375
(40 × 1.5) ÷ 2 = 30 (30 × 2) ÷ 3 = 20 (20 × 2.5) ÷ 4 = 12.5 (12.5 × 3) ÷ 5 = 7.5 (7.5 × 3.5) ÷ 6 = 4.375
(14.073)² + (32.103)² + (43.9653)² + (52.983)² + ? = (102.45)² + (98.007)²
12 18 31 51 ? 112
13 19 32 52 ? 113
12, 36, 80, 164, 328, ?
2, 2, 6, 30, ?, 1890
58 69 56 ? 54 73
17, 9, ?, 13.5, 25, 65
3 2 10 ? 17 16
78 79 75 84 ? 93 57
580 557 528 497 ? 419
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