Question

Susan had 8/9 acres of land. She planted 2/5 of it with corn. How many acres did she plant with corn?

Answer 1

$\bf \textit{how much is }\frac{2}{5}\textit{ of }\frac{8}{9}?\implies \cfrac{8}{9}\cdot \cfrac{2}{5}\implies \cfrac{16}{45}$

that's how many acres she planted with corn.