Question 330203
Let A be the amount of 15% alloy, B the amount of 45% alloy.
1.{{{A+B=60}}}
{{{15A+45B=32(60)=1920}}}
2.{{{A+3B=128}}}
Subtract eq. 1 from eq. 2,
{{{A+3B-A-B=128-60}}}
{{{2B=68}}}
{{{B=34}}}
Then from eq. 1,
{{{A+34=60}}}
{{{A=26}}}
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26 kilos of 15% alloy and 34 kilos of 45% alloy.