stonecold wrote:
What is the thousandths digit of the decimal d?
(1) The tenths digit of 100*d is 7.
(2) The units digit of 1,000*d is 7.
Statement 1:
If the tenths digit of 100*d is 7 the resulting number d would be something like xx.7xxx. This means if we do not multiply 100 to d the original number would be xx.xx7 (multiplying 100 to the original number shifts the number 7 two places to the right in the tenths place)
Hence this statement is sufficient.
Statement 2:
If the unitss digit of 1000*d is 7 the resulting number d would be something like x7.xxx. This means if we do not multiply 1000 to d the original number would be xx.xx7 (multiplying 1000 to the original number shifts the number 7 three places to the right in the units place)
Hence this statement is sufficient.
Answer: (D)
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