+0  
 
+1
249
4
avatar+628 

Serena took two numbers which may or may not be integers, rounded each of them up to the nearest integer, multiplied the results, and got 100. When she took the original numbers, rounded each of them down to the nearest integer and got X. What is the largest possible value of X?

supermanaccz  Mar 21, 2018
 #1
avatar+92477 
+1

The largest possible value for X  will be when the two integers are the same....this will occur when the first two integers are  > 9  but < 10

 

Rounding them up   produces  10 * 10  =  100

 

Rounding them down produces  9 * 9   =   81  =  X

 

 

cool cool cool

CPhill  Mar 21, 2018
 #2
avatar+628 
0

Huh, that’s what I got too, but the answer says 202, weird...

supermanaccz  Mar 21, 2018
 #3
avatar+92477 
0

Hmmm....maybe someone else knows how they got this......

 

 

cool cool cool

CPhill  Mar 21, 2018
 #4
avatar+628 
0

Or maybe the answer is wrong 

supermanaccz  Mar 21, 2018

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