LCM( 60, 225 ) = 900
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 60, b = 225 and GCD(60, 225) = 15.
$$ \text{LCM} (60, 225) = \frac{ 60 \cdot 225 }{ \text{GCD}(60,225)} = \frac{ 13500 }{ 15 } = 900 $$