PASO 1
(a+b)/2 = 103(a-b) = 18
PASO 2
a+b = 20 a-b = 6 suma ambas ecuaciones
2a = 26
a = 13
b = 7
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PASO 1
(a+b)/2 = 10
3(a-b) = 18
PASO 2
a+b = 20
a-b = 6 suma ambas ecuaciones
2a = 26
a = 13
b = 7