How many grams of must be dissolved in of to give a by-mass solution?

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Problem

How many grams of

\text{KCl}

must be dissolved in

60\,\text{g}

\text{H}_2\text{O}

to give a

20\%

by-mass solution? (1)

1.5\,\text{g}

(2)

15\,\text{g}

(3)

25\,\text{g}

(4)

12\,\text{g}