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

Mathematics

Keith Logan

28 June, 07:06

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?

+2

Answers (2)

Know the Answer?

Mollie Carson · Answer 1

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

Delaney Carr · Answer 2

"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