Final answer:
Marcy's 1.5 kilograms of beef converts to 1500 grams, which is more than the 900 grams required for her recipe, so she has enough beef for her stew.
Step-by-step explanation:
To determine if Marcy has enough beef for her recipe, we need to convert the weight of the beef from kilograms to grams since the recipe specifies the amount needed in grams. One kilogram is equal to 1000 grams. Therefore, Marcy's 1.5 kilograms of beef is equivalent to 1500 grams. Since her recipe calls for 900 grams of beef, and she has 1500 grams available, Marcy indeed has more than enough beef to prepare her beef stew.