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Percentagez — Maths STD 7 — Question

Maharashtra BoardEnglish MediumSTD 7MathsPercentagez1 Mark
Question
Mark $(\checkmark)$ against the correct answer in the following:
An ore contains 5% copper. How much ore is required to obtain 400g of copper:
  1. 2kg
  2. 4kg
  3. 6kg
  4. 8kg
✓

Answer

  1. 8kg
Solution:

Let x kg be the required amount of ore.

$=\frac{\text{x}\times5}{100}=400$

$\text{x}=\frac{400\times100}{5}=8000\text{g}$

$=8\text{kg}$

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