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Sagot :
Answer:
The composition is;
10 kg of copper and 15 kg of zinc
Step-by-step explanation:
let the weight of zinc be z and that of copper be c
The addition of both will give 25 kg
thus;
z + c = 25 ••••••(i)
secondly;
6.40(c) + 2.80(z) = 124
6.40c + 2.80z = 124 ••••••(ii)
from the first equation;
z = 25-c
substitute this into the second equation;
6.4c + 2.8(25-c) = 124
6.4c + 70 - 2.8c = 124
6.4c-2.8c = 124-70
3.6c = 54
c = 54/3.6
c = 15
Recall;
z = 25-c
z = 25-15
c = 10
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