If we know (1 + A + 1 / B + 1 / C + 1 / D) + 1 / 36 + 1 / 45 = 1, and a, B, C and D are just four continuous natural numbers, we can find the sum of a, B, C and D Today is the day,

If we know (1 + A + 1 / B + 1 / C + 1 / D) + 1 / 36 + 1 / 45 = 1, and a, B, C and D are just four continuous natural numbers, we can find the sum of a, B, C and D Today is the day,

First, we get the same score: (ABC + abd + ACD + BCD) / ABCD + 1 / 36 + 1 / 45 = 1
(ABC + abd + ACD + BCD) / ABCD = 171 / 180 is about 1
So it is shown that a, B, C and d have a multiple of 4 and ABCD = 180,
So a = 3, B = 4, C = 5, d = 6
So a + B + C + D = 18