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8th August 2011 21:21 #1
I am twice as old as my sister was when I was the age that she is now. The sum of our present ages is 49. How old are we?
2 - , , , . 49. ?
.
, "".
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8th August 2011 21:27 #2
, . z /2.
+=49
/2+z=
+z=
=21
=28
z=7Asrock B365 Pro4; Intel Core i5-9400F; Kingston HyperX 2x16Gb DDR4; Gigabyte Aorus GTX 1080ti
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9th August 2011 10:54 #3
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9th August 2011 11:14 #4
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9th August 2011 11:22 #5
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9th August 2011 11:31 #6
! 30 . . 5.90 . , . . , . , , . " ", , "", , 49. All, " ", , , . .
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9th August 2011 11:41 #7
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9th August 2011 11:37 #8
, 3 3 , , , . 5- . . , 30 , , ""...
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9th August 2011 11:50 #9






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