Brian's car was not running well. The car would occasionally lose power or stall out. Brian thought about the possible solutions: changing the ignition wires, putting an additive in the gas tank, or taking his car to a mechanic and letting the mechanic figure out the problem. Brian decided that he would try putting an additive in the gas tank first to see if that corrected the problem. Which one of Sternberg's intelligences does it sound like Brian was using