A farmer planted 4 acres of soybeans for every 9 acres of corn. he planted a total of 400 acres. how many total acres of soybean did he plant? (Round answer to the nearest whole acre.)

Lets have 4x acres of soybeans, then it is going to be 9x acres of corn

(4x/9x=4/9)

Altogether we have (4x+9x) acres

Altogether he planted 400 acres

So, we can write

4x+9x=400

13x=400

x=400/13

4x acres of soybeans

4*400/13≈123 acres of soybeans