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The MCQs below are drawn from the Mathematics subject category.
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7421
A number increased by 20% becomes 120. The number is?
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Correct Option
Explanation
Let the number be x. Increasing x by 20% gives 120% of x. So, 1.2x = 120. Solving for x gives x = 120 / 1.2 = 100.
7422
What is 0.15% of 33.33% of 10000?
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Correct Option
Explanation
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.
7423
If 20% of a = b, then b% of 20 is the same as:
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Correct Option
Explanation
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.
7424
30% of 140 is equal to x% of 840. Find x.
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Correct Option
Explanation
30% of 140 = (30/100) * 140 = 42. So, x% of 840 = 42. (x/100) * 840 = 42. 8.4x = 42. x = 42 / 8.4 = 5.
7425
The difference between 78% of a number and 59% of the same number is 323. What is 62% of that number?
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Correct Option
Explanation
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.
7426
65% of a number is 21 less than 4/5th of that number. Find the number.
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Correct Option
Explanation
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.
7427
Subtracting 20% of a number from the number itself gives 40. Find the number.
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Correct Option
Explanation
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.
7428
If 15% of x is equal to 20% of y, then x:y is?
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Correct Option
Explanation
Given 0.15x = 0.20y. Dividing both sides by 0.05 gives 3x = 4y. Therefore, the ratio x:y = 4:3.
7429
What is 40% of 20% of 1000?
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Correct Option
Explanation
First, calculate 20% of 1000, which is (20/100) * 1000 = 200. Next, calculate 40% of 200, which is (40/100) * 200 = 80.
7430
60% of what number is 30?
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Correct Option
Explanation
Let the number be y. 60% of y = 30. (60/100) * y = 30. y = (30 * 100) / 60 = 50.
