Answer:
As far as i know you should go for LCM that would be more convenient and easy to do
Answer:
B. 
Step-by-step explanation:
Simplify the given expression to determine its equivalent expression in the given options.






(x - 1) cancels (x - 1)




Answer: 2/3 of an hour.
Step-by-step explanation: The constant rate of the lifeguard filling the pool is 1/3 of the pool every 1/2 hour. If she fills it for an hour, she'll get 2/3 of the pool filled. Therefore, it'll take the lifeguard 1 hour to fill the pool 2/3 of the way.
Hope this helps! :)