The 11th triangular number = 66
If you want just 1430/75 in fraction form then:

after you divide it by 5.
If you want the divided number in fraction form then:

both give the same answer so it doesn't matter.
Simply add the two dosages together, (0.15+0.025) and the answer is 0.175 :)
444 divided by 3 equals 148