300
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.
100 - 75 = 25.
25
The LCM of 25, 50, and 75 is 150. The multiples of 25 are 25, 50, 75, 100, 125, 150, and so on. The multiples of 50 are 50, 100, 150, and so on. The multiples of 75 are 75, 150, and so on. So the LCM is 150.
75 25 + 75 = 100
(100-25)/100= .75 75%
The least common denominator of 25, 15, and 3 is 75. To get this we need to find the smallest number that is divisible by 25, 15, and 3 without any remainders. Since 25 has to go into the number it is easiest to first look at which numbers are divisible by 25 without any remainder. This would be numbers like 25, 50, 75, 100, etc. Then look at which of these numbers are divisible by 15 and 3 without any remainder. The first number that is is the least common denominator. In this case, it is 75.
25, 50, 75, 100
75 75 + 25 = 100
100-25 = 75
The LCM of 25 and 75 is 75.
25% of 75% = 25/100 x 75/100 = 3/16 = 3/16 x 100 % = 18.75 %