Yahoo Answers: Answers and Comments for Maths Percentage questions 3 [數學]
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From Tsui See
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Fri, 17 Nov 2006 22:11:50 +0000
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Yahoo Answers: Answers and Comments for Maths Percentage questions 3 [數學]
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From 路人甲: 4. A 60 kg ingot of brass, consisting of zinc ...
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Fri, 17 Nov 2006 22:17:35 +0000
4. A 60 kg ingot of brass, consisting of zinc and copper, contains 15% zinc. How many kilograms of copper does the 60 kg ingot of brass contain?
60x(115%) = 51kg
the 60 kg ingot contain 51kg of brass.
5. A fruit dealer bought a carload of apples weighing 1245 kg. After sorting, he discovered that 83 kg of them were spoiled. Find the percentage of unspoiled apples.
83x100% / 1245 = 6.67%
There are 6.67% of unspoiled apples.