Cooper $11\mathrm{.}0\mathrm{.}14$

What amounts of $20\%$ pure silver and $25\%$ pure silver should be mixed to obtain $14$ grams of $20\%$ pure silver? $[$either give EXACT answers, which are fractions, or give $5$ decimal places$]$

number of grams of $20\%$ silver is number of grams of $25\%$ silver is