Răspuns:
Explicație pas cu pas:
v= vaci
c=cai
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16v+12c=300 kg
4v+13c= 300-135= 165
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16v+12c=300 l :4
4v+3c= 75
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(4v+13c)-(4v+3c) = 165-75
(4v+13c)- (4v+3c)=90
4v-4v=0
13c-3c= 10 c
10c=90
c= 90:10
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c=9kg fan ( un cal)
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4v+13c= 165
4v= 165-(9x13)
4v= 165- 117
4v= 48 kg
v= 48:4
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v= 12 kg ( o vaca)