Which number is 5 tens less than 300 + 70 + 4?

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• A 324
• B 524
• C 379
• D 384

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Answer: A. 324

First find the number: 300 + 70 + 4 = 374. Five tens is 5 x 10 = 50, and 374 - 50 = 324. Only the tens digit drops, from 7 to 2.

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