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2014-04-26T17:13:38+03:00

a-b=6

(a+b)/2=10⇒a+b=20⇒a=20-b

a-b=6⇒20-b-b=6⇒20-2b=6⇒20=6+2b⇒14=2b⇒b=7

a=20-b⇒a=20-7⇒a=13

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2014-04-26T17:16:37+03:00
A-b=6
(a+b)/2=10 a+b=20
a=6+b
6+b+b=20
2b=14
b=7
a6+7
a=13
b=7

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