Ravi describes a 4-digit mystery number: "The digit in the thousands place is 6. The digit in the hundreds place is 3 less than the thousands digit. The digit in the tens place is twice the hundreds digit. The digit in the ones place is the same as the hundreds digit." What is the mystery number?
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Worked Solution
Step 1: Find the thousands digit.
Thousands = 6 (given).
Step 2: Find the hundreds digit.
Hundreds = 6 − 3 = 3.
Step 3: Find the tens digit.
Tens = 2 × 3 = 6.
Step 4: Find the ones digit.
Ones = same as hundreds = 3.
Step 5: Write the number in the correct place-value order.
Thousands–Hundreds–Tens–Ones = 6–3–6–3 = 6363.
Answer: The mystery number is 6363.
Correct answer: 6363
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