percentage Model Questions & Answers, Practice Test for ssc cgl tier 1

Question :16

What is 26% of 55% of $10/13$ th of 6100?

Answer: (e)

Required value = $6100 × 10/13 × 55/100 × 26/100 = 671$

Question :17

In a certain school, 20% of students are below 8 years of age. The number of students above 8 years of age is $2/3$ of the number of students of 8 years age which is 48. What is the total number of students in the school ?

Answer: (d)

Let the number of students be x.

Then, Total number of students of 8 years and above 8 years

= (100 – 20)% of x = 80% of x.

∴ 80% of x = 48 + 2/3 of 48

⇒ $80/100 x$ = 80 ⇒ x = 100.

Question :18

Sonali invests 15% of her monthly salary in insurance policies. She spends 55% of her monthly salary in shopping and on household expenses. She saves the remaining amount of Rs.12,750. What is Sonali's monthly income?

Answer: (b)

Percentage savings of Sonali

= 100 – (15 + 55) = 30%

Let her monthly income be x

$x × 30/100 = 12750$

$x = 12750 × 100/30 = 42, 500$

Question :19

855 candidates applied for a job, out of which 80% of the candidates were rejected. How many candidates were selected for the job ?

Answer: (e)

No. of candidates selected for job = 20% of 855

= ${20 × 855}/100$ = 171

Question :20

Water contains 14$2/7$ % of hydrogen and the rest is oxygen. In 350 g of water, oxygen will be

Answer: (b)

Ratio of Hydrogen and oxygen = 1 : 6

Now, oxygen in 350g of water $6/7 × 350$ = 300g

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