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प्रश्न
If in a stick of chalk, carbon is 3g, what is the weight of the chalk stick?
उत्तर
Let the total weight of chalk be x g.
Then, x of 12% = 3
x × 12% = 3
`x xx 12/100 = 3`
x = `(3 xx 100)/12`
x = 25g
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