Let me try
Lets say you have $10.75. As you would know, it has 7 in the 10ths digit and 5 in the 100ths digit.
Lets say, you multiply this amount with 10. So, now you have $107.5. Now, your 7 and 5 have moved up in the digits. i.e. 5 is in the 10ths digit now and 7 has moved to units place. Similarly, if you divide $10.75 by 10, you would have $1.075. Which means, 7 has moved to 100ths place and 5 has moved to 1000ths place.
So, in the problem,
Statement 1 - when d is multiplied by 10 (10d), its 10th digit is 7. This means, 7 was in 100ths place before multiplying by 10. So, 7 is greater than 5. SUFFICIENT
Statement 2 - when d is divided by 10, (d/10), its 1000ths digit is 7. Which means, 7 was in 100ths place before dividing by 10. So, 7 is greater than 5. SUFFICIENT
Answer is D
Hope this helps.
