Data Sufficiency
0/10 problems solved
Formulas & 30-Second Shortcut Tricks
Formulas
- Test Statement I alone, then II alone, then both together
- Sufficient = gives ONE definite answer (a definite 'No' is also sufficient)
- Never actually compute the final value if you can see it is determinable
Shortcuts
- Check for hidden info: 'integer', 'positive', 'consecutive'.
- Two independent linear equations in two unknowns ⇒ solvable.
Practice problems
What is the value of x? I. 2x + 3 = 11 II. x² = 16
What is A's age? I. A is 5 years older than B. II. B's age is 20.
Is n even? I. n is divisible by 4. II. n + 1 is odd.
What is the area of the rectangle? I. Its perimeter is 30 cm. II. Its length is twice its breadth.
On which day was Ravi born? I. His brother was born on Monday, two days before Ravi. II. Ravi was born in March.
What is the speed of the train? I. It crosses a 200 m platform in 20 s. II. It crosses a pole in 10 s.
Is x > y? I. x − y = 5 II. x + y = 9
How many students are in the class? I. Rank 12 from top and 18 from bottom (Rahul). II. There are 5 more boys than girls.
What is the profit percentage? I. Cost price is ₹400. II. Selling price is ₹500.
What is the value of the two-digit number? I. Sum of digits is 9. II. The tens digit is twice the units digit.
Data Sufficiency Speed Test
1 minute per question. Use the palette to jump around; you'll see time spent on every question at the end.