payshencec21
payshencec21
16-03-2018
Mathematics
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vunderkid
vunderkid
16-03-2018
x in litres is 67% herbicide
y in litres is 46% herbicide
{x+y=42
{0.67x+0.46y=42*0.55
{67x+46y=2310
{46x+46y=1932
21x=378
x=18 litres
A. She need to use 18L
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