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３％食塩水をxg、8％食塩水をygとすると、
3x/100＋8y/100＝6/100(x＋y)
6/100(x＋y)＋5＝7/100(x＋y＋5)
これを連立方程式で解くと
x＝186,y＝279
答えは３％食塩水186g、8%食塩水279g
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