If that's 5/12, 10/13 and 7/9, the LCD is 468.
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all of the LCDs of 10 are in 20, so 10 is useless. There are no common factors in 20 and 13, so the way to get it is 20 x 13 = 260
LCD(40, 50) = 200
Write the multiples of each: 5, 10, 15, 20 10, 20, 30, 40 10 is in each, so it is the answer.
20
The LCD of 5 and 4 is 20.
The least common multiple of 13 and 20 is 260.