To prepare 100.0 g of an NaCl solution that is 15.0 % NaCl by mass

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Problem

To prepare 100.0 g of an NaCl solution that is 15.0 % NaCl by mass, a technician has stock solutions that are 10.0 % and 25.0 % NaCl by mass. What mass of the 25.0 % solution should the technician use? (a) 66.7 g66.7\ \text{g} (b) 25.0 g25.0\ \text{g} (c) 33.3 g33.3\ \text{g} (d) 60.0 g60.0\ \text{g}

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