The card shop has two boxes of cards. The first box contains cards that cost $1.25 each. The second box contains cards that cost $1.75 each. A boy then comes in and buys 6 cards from each box. What was the total cost, in dollars, of the cards he bought?
The cost of one card from each box in total is 1.25+1.75=<<1.25+1.75=3>>3 dollars.
The total cost of cards the boy bought is 3*6=<<3*6=18>>18 dollars.
#### 18