What digit goes in the box to make the number 3□72 divisible by 9?

Answer and explanation

Correct answer: B. 6

  1. Step 1: A number is divisible by 9 when its digit sum is a multiple of 9. Step 2. 3 + 7 + 2 = 12, so the box must make the total 18. Step 3. The digit is 18 - 12 = 6. Answer: 6. Why not the others: 3: This gives a digit sum of 15, which is not a multiple of 9. 0: This gives a digit sum of 12, which is not a multiple of 9. 9: This gives a digit sum of 21, which is not a multiple of 9.

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