Word problems: adding/subtracting fractions

The elves are packing M& M's for stockings. They start with 3/4 a pound and used 1/4 how much is left?

Snow fell at the North Pole twice in one day. The town received 3/8 inch of snow in the morning and another 2/8 inch of snow in the afternoon. How many total inches of snow fell at the North Pole on that day?

Joe has listed the first 4 factors of 42 as:  1   6    7     40

Which one is incorrect?

Add the following fraction:

(a)  

Which of the following is true?

Which of the following equations is true?

Add the following:  $$\frac{5}{6}+\frac{7}{6}$$

(a)  

Zack and Julie started a lemonade stand to raise money.
They donated $$\frac{4}{10}$$  of their profits to their school library,  $$\frac{1}{10}$$   to the animal shelter, and  $$\frac{3}{10}$$   to the food bank. They saved the rest to buy materials for their next project. 

(a)  

Raja is baking his favorite cookies. The recipe calls for  $$\frac{3}{8}$$  of a stick of butter, but he wants to double the recipe.

How much butter will Raja need?

(a)