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Tsui See 發問於 科學及數學數學 · 1 十年前

Maths Percentage questions 3

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?

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.

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  • 1 十年前
    最愛解答

    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(1-15%) = 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.

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