IMO = B
Since Unit digit of K is non zero it can have value from (1 to 9 )
Now lets analyse stmt 1 : K + 4 give 3 as 10th unit. so if go by substitution method then
i> for unit value (1 to 5 ) + 4 , we should have 3 itself as 10th digit
ii> for unit value ( 6 to 9 ) + $ , we should have 2 as 10th value
which mean we can have either 2 or 3 as 10th place which make this statement insufficient.
Let move on to 2nd statement.
for any value for unit place ( 1 to 9 ) , we must have 3 as 10th unit to give k + 9 = 4 as 10th unit.
Since we have absolute value for 10th digit here, this statement is sufficient.
Numbers
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Source: Beat The GMAT — Data Sufficiency |
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Target2009
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Target2009 wrote:IMO = B
Since Unit digit of K is non zero it can have value from (1 to 9 )
Now lets analyse stmt 1 : K + 4 give 3 as 10th unit. so if go by substitution method then
i> for unit value (1 to 5 ) + 4 , we should have 3 itself as 10th digit
ii> for unit value ( 6 to 9 ) + $ , we should have 2 as 10th value
which mean we can have either 2 or 3 as 10th place which make this statement insufficient.
Let move on to 2nd statement.
for any value for unit place ( 1 to 9 ) , we must have 3 as 10th unit to give k + 9 = 4 as 10th unit.
Since we have absolute value for 10th digit here, this statement is sufficient.
K is given as three digt number but not mentioned whether positive/negative.
What if it is negative?
Statement 2 becomes insufficient
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nisha.menon294
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