(1 / 10 + 1 / 100 + 1 / 1000 + 1 / 10000) / (1 / 100 + 1 / 1000) simple calculation

(1 / 10 + 1 / 100 + 1 / 1000 + 1 / 10000) / (1 / 100 + 1 / 1000) simple calculation

(1 / 10 + 1 / 100 + 1 / 1000 + 1 / 10000) / (1 / 100 + 1 / 1000) = (1 / 10 + 1 / 100 + 1 / 1000 + 1 / 10000) x10000 / [(1 / 100 + 1 / 1000) x10000] = (1000 + 100 + 10 + 1) / (100 + 10) = 1111 / 110 = 101 / 10,