In the equal ratio sequence {an}, the 7th power of a + the 6th power of a = 5, the 4th power of a + the 15th power of a = 5, then the 20th power of a / the 10th power of a =?

In the equal ratio sequence {an}, the 7th power of a + the 6th power of a = 5, the 4th power of a + the 15th power of a = 5, then the 20th power of a / the 10th power of a =?

The 55th power of 2 = the 11th power of the 5th power of 2, the 44th power of 3 = the 11th power of the 4th power of 3, the 33rd power of 4 = the 11th power of the 3rd power of 4