Answer
100
Work Step by Step
Multiples of 50: 50, 100, 150
In order to find the LCM of 20 and 50, we must find the first multiple of 50 that is also divisible by 20.
50 is not divisible by 20.
$100\div20=5$
Therefore, 100 is the LCM of 20 and 50.