In limestone, 40% is calcium and the rest is carbon and oxygen. If in 20 kg of limestone, there is 9.4 kg of… · ABC26GN2288

Subject: General Aptitude · Chapter: Percentage

In limestone, 40\% is calcium and the rest is carbon and oxygen. If in 20 kg of limestone, there is 9.4 kg of oxygen, then what is the percentage of carbon in it?

(a)12\%

(b)13\%

(c)14\%

(d)15\%

Answer

Answer (as printed): B

Explanation

Percentage of oxygen $=\left(\frac{9.4}{20} \times 100\right) \%=47 \%$. $$\text { ∴ } \text { Percentage of carbon }=[100-(40+47)] \%=13 \% .$$

Explanation as extracted from the printed page; notation may be imperfect.

Study loop for Percentage

1. Practise the PYQsPrevious-year questions, with answers

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