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The place value of F in English alphabet is = 6. So, F = (6 × 2) = 12. Similarly, FED = [(Sum of place value of F, E and D) × 2] = [(6 + 5 + 4) × 2] = 15 × 2 = 30. Now, FEED = [(6 + 5 + 5 + 4) × 2] = [20 × 2] = 40.
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