Mathematics question

Question

On Monday the book store sold 75 books and on Tuesday the book store sold 125 books the book store must sell 500 by Friday how many books must the book store sell ? Write an equation

Answer 1

The store needs to sell 500 books. They sold 75 books on Monday and 125 books on Tuesday.

Option 1: Break the question down into two steps:

Step 1: How many books have they sold so far?

(Books sold on Monday) + (Book sold on Tuesday) = Total books sold

75 + 125 = 200

Step 2: How many more books do they need to sell?

(Total books they need to sell) - (Total books sold) = Number of books left to sell

500-200 = 300

Option 2: Combine steps 1 and steps 2 above into one equation

(Total books they need to sell) - (Books sold on Monday) - (Books sold on Tuesday) = Number of books left to sell

500 - 75 - 125 = 300