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[1] 0.2b + 0.25a = 7
[2] 2(0.5(0.2b)) = 5
Desarollando [2]
2(0.5(0.2b)) = 5
2(0.1b) = 5
0.2b = 5
b = 5/0.2
b = 25
Reemplazando b en [1]
0.2b + 0.25a = 7
0.2(25) + 0.25a = 7
5 + 0.25a = 7
0.25a = 2
a = 2/.25
a = 8
La mitad de a = 4. Respuesta D
20B/100 + 25A/100 = 7 ------> B/5 + A/4 = 7
el otro dato dice:
2B*50/100*20/100 = 5 --------> B = 25
REEMPLAZANDO:
25/5 + A/4 = 7
5 + A/4 = 7 -------> A = 8
A /2 = ???
POR LO TANTO LA RESPUESTA, SERA:
A/2 = 8/2 = 4 , respuesta D