If ∫13f(x)dx=5\int_{1}^{3} f(x) dx = 5∫13f(x)dx=5 and ∫35f(x)dx=2\int_{3}^{5} f(x) dx = 2∫35f(x)dx=2, find ∫15f(x)dx\int_{1}^{5} f(x) dx∫15f(x)dx.
333
777
101010
2.52.52.5