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08 Aug 2012, 20:47
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Q How many three-digit positive integers can be divided by 2 to produce a new integer with the same tens digit and units digit as the original integer?
None
One
Two
Three
Four
The answer is four. Can you please explain in detail how this was achieved. Will really appreciate the help. Thank you!
None
One
Two
Three
Four
The answer is four. Can you please explain in detail how this was achieved. Will really appreciate the help. Thank you!
09 Aug 2012, 04:33
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askhokha
When will the digits stay the same even after division by 2? The original number has to be divisible by 2 since the new number is also an integer.
Think: 242 divided by 2 gives 121. 546 gives 273 etc
The last two digits will not be the same. There must be some special property of last 2 digits for them to stay the same. Also, there are very few such numbers since answer is 0/1/2/3/4.
If the last two digits are 0s, they might remain 0s.
200 comes to mind. 200 divided by 2 gives 100. Last two digits are same.
What about 300? 300/2 = 150
So the hundreds digit must be even. Therefore, the only numbers are 200, 400, 600, 800.
