Answer:
300
Step-by-step explanation:
20 = 2² × 5
25 = 5²
30 = 2 × 3 × 5
For the LCM, you need common and not common factors with higher exponent.
Out of 2² and 2, chose 2².
Out of 3 chose 3.
Out of 5 and 5² choose 5².
LCM = 2² × 3 × 5² = 300
Answer: 300
