Answer is 3.84kg
[tex]\text{If }\frac{2}{5}\text{ of the farmer sale is apple, then the remaining fraction, which is,1- }\frac{2}{5}=\frac{3}{5}\text{ will be for pears}[/tex][tex]so,\frac{3}{5}\times6.4=3.84\operatorname{kg}[/tex]So, the farmer sold 3.84kg of pears at the farmers market
