150
LCD (Least Common Divisor) is not a normal term. LCM (Least Common Multiple) is, as well as GCD (Greatest Common Divisor). The LCM of 10 and 25 is 50, while the GCD of 10 and 50 is 10. I suppose if you were really looking for the LCD of 10 and 25, it is 5.
15 = 3 x 5 25 = 5 x 5 6 = 2 x 3 LCM = 2 x 3 x 5 x 5 = 150
LCD(6, 14) = 42
600
LCD(25, 20, 4) = 100.
LCD = 500-150 = 350 and can be written as CCCL
LCD(5, 7, 25) = 175
25% of 150 = 25% * 150 = 0.25 * 150 = 37.5
LCD(180, 150) = 900
600
60