+0  
 
0
643
6
avatar+286 

which of these numbers can not be obtained by adding less than four perfect squares?

 

A)59   B)69  C)79  D)89   E)99

 Nov 17, 2015

Best Answer 

 #6
avatar+286 
+5

Thanks

 Nov 18, 2015
 #1
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+5

Squares (I assume you cannot use the same perfect square more than once)...so which THREE add up to one of the numbers?   (1 4 64   add to 69....there is one!)

1

4

9

16

25

36

49

64

81

 Nov 17, 2015
 #2
avatar+286 
+5

There is no rule on using more than one of the same perfect squares.

 Nov 17, 2015
 #3
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+5

64 + 25 = 89     is another one

49 + 1 + 9 = 59       Is another ...I'm guessing ALL of them will work out.....

 Nov 17, 2015
 #4
avatar+286 
+5

I think that 79 wouldn't not work out.Though i'm not too sure

 Nov 17, 2015
 #5
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+5

81 + 9 + 9 = 99

 

Now.....79 hmmmm   can't see how to get there!  Must be 79

 Nov 17, 2015
 #6
avatar+286 
+5
Best Answer

Thanks

buubleman Nov 18, 2015

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