A type of coal has carbon content of 80% was found to have 5% of sulphur. If the quantity of sulphur in the given variety of coal was 10 grams, then what was the total carbon content in the given type of coal?

120 grams

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160 grams

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240 grams

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320 grams

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Solution

The correct option is B
160 grams

5% of coal (Let say x) = 10 grams
This implies, x = $\frac{10}{0.05}$ = 200 grams
Now, Carbon content=80% of coal
Hence, 80% of coal = (200 $*$ 0.8) grams = 160grams

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