In one day, a store sold as many DVDs as Blu-ray discs. The total number of DVDs and Blu-ray discs sold that day was ____. How many DVDs were sold?
a) Equal to the number of Blu-ray discs
b) Twice the number of Blu-ray discs
c) Half the number of Blu-ray discs
d) Three times the number of Blu-ray discs