A park takes up 150 acres of land. Each country takes up 1/5 of the park's land. The roller coasters take up 4/15 acres of each country's land. How much of each country's land is not taken by roller coasters? Show answer, please!
1/5 + 4/15 = 3/15 + 4/15 = 7/15
so, what is 8/15 of 150?