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2014-11-15T20:20:23+02:00
( 4* 12,5 + x ) / 5 = 13 | *5
4 * 12,5 + x = 65 
50 +x =65
x= 15
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2014-11-15T20:23:26+02:00
(a+b+c+d)4=12.5
a+b+c+d=4*12.5=50
(50+e)/5=13
50+e=65
e=65-40
e=15 puncte
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