There are five cars in line at a stoplight. each of these cars is a different color and different type of car. diego is driving the red car. ingrid is driving the sedan. the green car is immediately behind the white car. the minivan is third in line. rachel is driving the first car in line. anton is just behind the driver in the suv. yuna is driving the green car. the driver in the yellow car is just in front of the convertible. rachel is just in front of the blue car. the sedan is white. one of the cars is a pickup truck. who is driving the pickup truck?
q471

Ok, here we go:
5 cars total.
1. Rachel - first car in line, yellow, SUV
2. blue car (Rachel is in front of the blue car), convertible, Anton
3. minivan - third car in line, Diego
4.  white car, sedan, Ingrid
5. green car, immediately behind white car, Yuna, pickup

We know that Rachel is first, a blue car is second and the minivan is third.  We know that 3, 4 cannot be a convertible since one is a minivan and the other is a sedan.  We also know that a yellow car is in front of the convertible. 

Based off of that we know that car 5 cannot be a convertible since 4 is white and not yellow. So 1 or 2 is the convertible and SUV.  But we know that Rachel is in front of a blue car and the yellow car is in front of a convertible so that makes car #2 the blue convertible and car #1 the yellow SUV. 

Fill in what you do know and start to eliminate the outliers.  Hope that helps.

Xis equal to three