Z W Y X

The sequence above may be changed in either of two ways. Either two adjacent letters may be interchanged or the entire sequence may be reversed. What is the __least__ number of such changes needed to put the letters into alphabetical order from left to right?

(A) 2

(B) 3

(C) 4

(D) 5

(E) 6

Level of Difficulty E

Some problems simply involve "playing around" until you get the right answer. If you play around with the given sequence of letters, you will notice that switching the W and Y will produce:

Z Y W X

Then, switching the W and X will give:

Z Y X W

Now all we need is to reverse the entire sequence to get:

W X Y Z

and we have alphabetical order with three (3) changes, or choice B.

Our SAT tutors can help you become very proficient with all types of math SAT questions.

- Fractions
- Area of Rectangle
- Visual Exercise
- Combined Rates
- 3D Solids
- Integers
- Simple Arithmetic
- Coordinate Pairs
- Signed Numbers
- Decimal Equivalents
- Displacement
- Symmetry
- Integers
- Triangles
- Integer Properties
- Cubic Functions
- Proportions
- Divisibility Rules
- Simple Squares
- Sets
- Sequences
- Rate Vectors
- Number Lines
- Word Problem
- Triangles
- Graph Theory
- 3D Solids
- Positive Integers
- Number Theory
- Even Integers
- Number Theory