Smith sold 45 of his DVDs and purchased 10 more. If Smith has 15 DVDs now, how many DVDs did he have to begin with?

Question

Meredith Powell

Mathematics

25 September, 09:47

Smith sold 45 of his DVDs and purchased 10 more. If Smith has 15 DVDs now, how many DVDs did he have to begin with?

+4

Answers (2)

Know the Answer?

Josue Peck · Answer 1

"x" represents the DVDs Smith began with:

(x-45) + 10=15

Sold (-) 45, bought (+) 10, has (=) 15

Solve for x:

(x-45) + 10-10=15-10

x-45=5

x-45+45=5+45

x=50

Quincy Scott · Answer 2

Let's set up a formula for this, where x is the amount of dvds he started with:

x-45+10=15

x-35=15

+35 + 35

x=50

He had 50 DVDs to begin with.

Check

50-45+10

=15