Data Sufficiency

Question 0

Strategy: Don’t Solve

Answer 0

A single-variable linear equation is enough to find the vale of the variable.

A system of independent linear equations with as many equations as variables is enough to find the value of any variable

Question 1

DS answer choices

Answer 1

Statement 1 alone
Statement 2 alone
Both statements combined
Each statement alone
Not even both combined

Question 2

Approaches to DS questions

Answer 2

Always know what you need to determine before combining

Always consider the statements separately before combining

Question 3

DS first steps

Answer 3

Set up an equation
Factor / FOIL
Set up a system and solve with substitution
Apply exponent rules
Test cases
Apply angle properties and look for right triangles

Question 4

2 categories of DS questions

Answer 4

Yes/No

Question 5

Strategy Tip

Answer 5

Don’t confuse ‘No’ with insufficiency. If you can answer the question ‘No’ with certainty, the statement is sufficient.