Question
7Â Â Â Â 12Â Â Â Â 34Â Â Â Â 117Â Â Â Â ?Â
  2465   14820 What should come in place of question mark ‘?’ in the following number series?Solution
7 × 1 + 5 = 12 12 × 2 + 10 = 34 34 × 3 + 15 = 117 117 × 4 + 20 = 488  488 × 5 + 25 = 2465 2465 × 6 + 30 = 14820
If a : b = 4 : 5 and b : c = 6 : 7, find a : c.
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