Martin bought 10 concert tickets, some at the full price of $2.00 per ticket, and some at a discounted price of $1.60 per ticket. If he spent a total of $18.00, how many discounted tickets did he buy? Choose the correct choice from the following:
A) 3
B) 4
C) 5
D) 6
E) 7
Let x be the number of tickets he bought at $2 per ticket.   then 2 x + (10-x)1.6 = 18   0.4x = 2 =&gt; x = 5   discounted tickets = 10 -x = 5   Ans : 5
<result>C</result>
Martin bought 10 concert tickets, some at the full price of $2.00 per ticket, and some at a discounted price of $1.60 per ticket. If he spent a total of $18.00, how many discounted tickets did he buy?