The Number of acres of the farmland that is rice is 710 acres.
We are told that Austin planted his farm acreage in cotton and rice in the ratio of 4 to 5. Thus;
Ratio of cotton to rice = 4:5
Thus, fraction of the whole that is cotton = 4/9
Fraction of the whole that is rice = 5/9
We are given that the total size of his land is;
Total size = 1278 Acres
Thus;
Number of acres of the farmland that is rice is; 1278 * 5/9
Number of acres of the farmland that is rice is = 710 acres
Thus, we can conclude that the Number of acres of the farmland that is rice is 710 acres.
Read more about Ratio Problems at; https://brainly.com/question/1781657
#SPJ1