Answer:
(i) Total of parts = 10 + 3 + 12 = 25 Per cent of carbon in chalk \[=\frac{3}{25}\times 100%=12%\] (ii) Let the weight of the chalk stick of chalk be P. Then, 12% of P = 3 \[\frac{12}{100}\times P=3\] \[P=\frac{3\times 100}{12}=25g\] \[P=25g\] Hence, the weight of the chalk stick is 25 g.
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