Discussion
If TRAIN = 50, then BUS = ?
Answer: C
On the key's pattern, BUS = 30.
The pattern that fits both words is 10 for each letter: TRAIN has 5 letters, so \(5 \times 10 = 50\), and BUS has 3 letters, so \(3 \times 10 = 30\).
The other common coding rule, adding alphabet positions, does not fit: TRAIN would be \(20 + 18 + 1 + 9 + 14 = 62\), not 50. For BUS it would give 42, which is not an option either; 40, 44 and 46 fit no consistent rule.
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