Answer :
29.5-(1.5x15)
= $7
Hence: he spent $7 on the student discount card.
I subtracted the amount he spent on 15 passes with the discount card from the total amount he spent to find the amount he spent on the discount card:)
= $7
Hence: he spent $7 on the student discount card.
I subtracted the amount he spent on 15 passes with the discount card from the total amount he spent to find the amount he spent on the discount card:)