Question 956034
N=number of DVDs; N+10=number of CDs
$7N+$5(N+10)=$530
$7N+$5N+$50=$530
$12N=$480
N=40 ANSWER 1:They sold 40 DVDs
N+10=40+10=50 ANSWER 2:They sold 50 CDs
CHECK:
$7(40)+$5(50)=$530
$280+$250=$530
$530=$530