An alloy is made from lead and iron in the ratio 4:7. How much lead needs to be mixed with 8.4kg of iron?
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Answer:
Zinc : copper = 7 : 9 : : x : 11.7
= 7/9 x/11.7
cross multiplication
= 7*11.7=9*x
= 81.9 = 9x
= 81.9/9 = x
= 9.1 = x
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