Dan has $ 46. He bought some candy bar for $ 34 each one costing $ 17. How many candy bar did he buy?
Dan has $46. 
He buys candy bars for $34 each. 
$34 multiplied by some number equals $46. 

$34 multiplied by 1 equals $34. 
$34 multiplied by 2 equals $68. 

$68 is too much, so we know he didn't buy 2 candy bars. 
$34 multiplied by 1 equals $34, which is the amount of money Dan has. 

Therefore, Dan bought 1 candy bar.