In the multiplication above, # represents a single digit.
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A
B
C
D
E
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We're told that # times 512 equals two thousand and something.
Well, 4 times 512 = two thousand and something.
And 5 times 512 = two thousand and something.
No other digits, when multiplied by 512 will give us two thousand and something
So, let's test 4 and 5 (answer choices C and D)
If # = 4, we get: (4)(510) = 2040 (doesn't meet the condition that the product is 2##0. ELIMINATE C
f # = 5, we get: (5)(510) = 2550.
Perfect! This meets the condition that the product is 2##0.
Answer: D
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We see that when a number in the low 500s is multiplied by a single digit number, the product is in the 2000s. Therefore, that single digit number must be either 4 or 5.
If it's 4, then we have 510 x 4 = 2040. However, this is not correct, given that the pound sign (#) can only represent one unique digit.
If it's 5, then we have 510 x 5 = 2550. We see that the pound sign must be 5.
Answer: D
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