Aptitude - Percentage
6.
150% of 15 + 75% of 75 = ?
Answer
150% of 15 + 75% of 75 =
150100 x 15 + 75100 x 75 
= 452 + 2254
= 90 + 2254 = 78.75
Answer :
Option BExplanation :
150% of 15 + 75% of 75 =
150100 x 15 + 75100 x 75 = 452 + 2254 =
90 + 2254 = 78.75 7.
What percent of 7.2 kg is 18 gms ?
Answer
Let x% of 7.2 kg = 18 gms. Then,
x100 x 7.2 x 1000 = 18 ⇒ 72x = 18 ⇒ x = 0.25
∴ 0.25% of 7.2 kg = 18 gms
Answer :
Option BExplanation :
Let x% of 7.2 kg = 18 gms. Then,
x100 x 7.2 x 1000 = 18 ⇒ 72x = 18 ⇒ x = 0.25
∴ 0.25% of 7.2 kg = 18 gms
8.
In an examination, 65% of the total examinees passed. If the number of failures is 420, the total nmuber of examinees is
Answer
Failures = 35% of total examinees.
Let the number of examinees be x. Then,
35% of x = 420 ⇒ 35100 x x = 420
⇒ x = 420 x 207 = 1200
∴ Total number of examinees = 1200
Answer :
Option DExplanation :
Failures = 35% of total examinees.
Let the number of examinees be x. Then,
35% of x = 420 ⇒ 35100 x x = 420
⇒ x = 420 x 207 = 1200
∴ Total number of examinees = 1200
9.
The reduction of 20% in the price of sugar enables a purchaser to obtain 3 kg more for Rs. 120. The original price of sugar per kg is :
Answer
Let the original price be Rs. x per kg.
Reduced price = Rs. (80% of x) = Rs. 80100 x x = Rs. 4x5 per kg
120 4x5 − 120x = 3 ⇒ 120 x 54x − 120x = 3
⇒ 120 x 54x − 120x = 3
⇒ 3x = (150 − 120) = 30 ⇒ x = 10
Answer :
Option CExplanation :
Let the original price be Rs. x per kg.
Reduced price = Rs. (80% of x) = Rs.
80100 x x = Rs. 4x5 per kg120 4x5 − 120x = 3 ⇒ 120 x 54x − 120x = 3
⇒ 120 x 54x − 120x = 3
⇒ 3x = (150 − 120) = 30 ⇒ x = 10
10.
In an election between the two candidates, the candidate who gets 30% of the votes polled is defeated by 16000 votes. What is the total number of votes polled ?
Answer
Let the votes polled be x. Then,
70% of x − 30% of x = 16000 ⇒ (70% − 30%) of x = 16000
⇒ 40100 x x = 16000 ⇒ x = 16000 x 10040 = 40000
Answer :
Option DExplanation :
Let the votes polled be x. Then,
70% of x − 30% of x = 16000 ⇒ (70% − 30%) of x = 16000
⇒ 40100 x x = 16000 ⇒ x = 16000 x 10040 = 40000
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