Percentage
- 30% of y is 72. The value of y is:
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Given that , 30% of y = 72
∴ y = 72 × 100 = 240 30 Correct Option: B
Given that , 30% of y = 72
∴ y = 72 × 100 = 240 30
Hence , The value of y is 240.
- If 15% of (A + B) = 25% of (A – B), then what percent of B is equal to A?
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According to question ,
15% of (A + B) = 25% of (A – B)⇒ 15 (A + B) = 25 (A - B) 100 100
⇒ 15 (A + B) = 25 (A – B)
⇒ 15 A + 15 B = 25A – 25 B
⇒ 10 A = 40 B
⇒ A = 4B
Now, let p% of B is equal to A∴ p × B = A 100
Correct Option: D
According to question ,
15% of (A + B) = 25% of (A – B)⇒ 15 (A + B) = 25 (A - B) 100 100
⇒ 15 (A + B) = 25 (A – B)
⇒ 15 A + 15 B = 25A – 25 B
⇒ 10 A = 40 B
⇒ A = 4B
Now, let p% of B is equal to A∴ p × B = A 100 ⇒ p × B = 4B 100
∴ p = 400%
- In an examination 42% of the candidates failed in physics, 24% of the candidates failed in Chemistry and 14% of the candidates failed in both the subjects. If 72 candidates passed in both, find the total number of candidates in the examination.
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Percentage of students failed only in :
Physics = 42 – 14 = 28
Chemistry = 24 – 14 = 10
∴ Percentage of students who
failed in Physics or Chemistry or both = 28 + 10 + 14 = 52
∴ Percentage of candidates who passed
= 100 – 52 = 48
If the total number of students be x, thenx × 48 = 72 100 ⇒ x = 72 × 100 = 150 48 Correct Option: C
Percentage of students failed only in :
Physics = 42 – 14 = 28
Chemistry = 24 – 14 = 10
∴ Percentage of students who
failed in Physics or Chemistry or both = 28 + 10 + 14 = 52
∴ Percentage of candidates who passed
= 100 – 52 = 48
If the total number of students be x, thenx × 48 = 72 100 ⇒ x = 72 × 100 = 150 48
- An army lost 10% of its men in war, 10% of the remaining died due to disease and 10% of the rest were declared disabled. Thus the strength of the army was reduced to 7,29,000 active men. The original strength of the army was
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Initial number of soldiers in the army = x
According to the question,x × 90 × 90 × 90 = 729000 100 100 100 ⇒ x = 729000 × 1000 = 1000000 9 × 9 × 9 Correct Option: B
Initial number of soldiers in the army = x
According to the question,x × 90 × 90 × 90 = 729000 100 100 100 ⇒ x = 729000 × 1000 = 1000000 9 × 9 × 9
- If the value of a company stock drops from Rs. 25 per share to Rs. 21 per share, the percentage decrease per share is :
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Required percentage decrease
= 
25 - 21 
× 100 25 = 400 = 16% 25 Correct Option: D
Required percentage decrease
= 25 - 21 × 100 25 = 400 = 16% 25
