Scholastic books sells 4 times as many textbooks as keller publishing; together they sold 7,775 textbooks. how many did scholastic sell?

Let us assume the number of text books sold by keller publishing = x

Then

Then number of text books sold by Scholastic books = 4x

The total number of text books sold = 7775

Then

x + 4x = 7775

5x = 7775

x = 1555

Then

The nu mber of text books sold by Scholastic books = 4x

= 4 * 1555

= 6220

I hope the procedure is clear enough for you to understand.