a+b = 60
a = 60 - b
_____
(60-b)/2 = b/4
(60-b) = b/2
2(60) -2b = b
2(60) = 3b
b = 40
____
40/4 = c/7
10= c/7
c = 70
Respuesta = C = 70
espero t sirva :)
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a+b = 60
a = 60 - b
_____
(60-b)/2 = b/4
(60-b) = b/2
2(60) -2b = b
2(60) = 3b
b = 40
____
40/4 = c/7
10= c/7
c = 70
Respuesta = C = 70
espero t sirva :)