Mathematics/General Ability MCQs
Topic Notes: Mathematics/General Ability
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
181
What is 0.15% of 33.33% of 10000?
Answer:
5
33.33% is approximately 1/3. So, 1/3 of 10000 = 10000/3. Now, find 0.15% of this. 0.15% = 0.15 / 100 = 15 / 10000. (15/10000) * (10000/3) = 15 / 3 = 5.
182
If 20% of a = b, then b% of 20 is the same as:
Answer:
4% of a
Given b = 0.20a. We need to find b% of 20, which is (b/100) * 20 = b/5. Substitute b = 0.20a: (0.20a) / 5 = 0.04a, which is 4% of a.
183
30% of 140 is equal to x% of 840. Find x.
Answer:
5
30% of 140 = (30/100) * 140 = 42. So, x% of 840 = 42. (x/100) * 840 = 42. 8.4x = 42. x = 42 / 8.4 = 5.
184
The difference between 78% of a number and 59% of the same number is 323. What is 62% of that number?
Answer:
1054
Difference = 78% - 59% = 19%. Let the number be x. 19% of x = 323. So, x = 323 / 0.19 = 1700. We need 62% of x = 0.62 * 1700 = 1054.
185
65% of a number is 21 less than 4/5th of that number. Find the number.
Answer:
140
4/5th of a number is 80% of the number. The problem states 80% of x - 65% of x = 21. So, 15% of x = 21. x = (21 * 100) / 15 = 140.
186
Subtracting 20% of a number from the number itself gives 40. Find the number.
Answer:
50
Let the number be x. x - 20% of x = 40. This means 80% of x = 40. (80/100) * x = 40. x = (40 * 100) / 80 = 50.
187
If 15% of x is equal to 20% of y, then x:y is?
Answer:
4:3
Given 0.15x = 0.20y. Dividing both sides by 0.05 gives 3x = 4y. Therefore, the ratio x:y = 4:3.
188
What is 40% of 20% of 1000?
Answer:
80
First, calculate 20% of 1000, which is (20/100) * 1000 = 200. Next, calculate 40% of 200, which is (40/100) * 200 = 80.
189
60% of what number is 30?
Answer:
50
Let the number be y. 60% of y = 30. (60/100) * y = 30. y = (30 * 100) / 60 = 50.
190
If x% of 500 is 50, find the value of x.
Answer:
10
We have (x/100) * 500 = 50. This simplifies to 5x = 50. Dividing by 5 gives x = 10.