Jake has 2.3 miles squared of farmland behind the bakery. he planted tomatoes on 0.3 of his land. on how many square miles did he plant tomatoes

We have that

Jake has > 2.3 miles squared of farmland
He planted tomatoes on 0.3 of his land > this is the 30%
therefore

if 2.3 miles squared > 100%
    X > 30%
X=30*2.3/100=0.69 miles squared

the answer is 0.69 miles squared