Question
10Â Â Â Â 15Â Â Â Â 40Â Â Â Â 135Â Â Â Â ?Â
  2825   16980Solution
10 × 1 + 5 = 15 15 × 2 + 10 = 40 40 × 3 + 15 = 135 135 × 4 + 20 = 560 560 × 5 + 25 = 2825 2825 × 6 + 30 = 16980
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