Part 31 of our Numerical Ability reviewer has 20 practice questions in the style of the Civil Service Exam. Answer them in order, read the explanation after each one, and check your score against the 80% passing mark at the end. Questions and choices are reshuffled every time you retake the part.
Start Part 31Sample questions from Part 31
Here are a few questions from this part. Take the full test to answer all 20 and get your score.
Sample question 1
25% of a number is equal to 55% of 20. What is 75% of that number?
- 72.6
- 44
- 15
- 33
Answer: 33
Number = 55% × 20 ÷ 25% = 20 × 55 ÷ 25 = 44. Then 75% of 44 = 33.
Sample question 2
What is √256?
- 16
- 17
- 128
- 18
Answer: 16
16 × 16 = 256, so √256 = 16.
Sample question 3
If a = 1, b = −3 and c = 2, what is the value of (a² − b³)(c − a) ÷ (a + b)?
- −14
- 42
- 14
- −21
Answer: −14
Substitute with parentheses around negative values: a = 1, b = −3, c = 2 in (a² − b³)(c − a) ÷ (a + b). Carefully evaluating each power and bracket (odd powers keep the sign of the base; even powers are positive) gives −14.
Sample question 4
Evaluate: (22)3
- 128
- 12
- 64
- 32
Answer: 64
Multiply the exponents: (22)3 = 26 = 64. Answer: 64.
Sample question 5
Liza bought 4.5 kilos of bangus at ₱80 per kilo. How much did Liza pay?
- ₱400
- ₱440
- ₱36
- ₱360
Answer: ₱360
4.5 × ₱80 = ₱360.