percentages Model Questions & Answers, Practice Test for ssc chsl tier 1 2023
ssc chsl tier 1 2023 SYLLABUS WISE SUBJECTS MCQs
Number System
Simplification
Powers Surds & Indices
Ratio Proportion & Partnership
Percentages
Profit & Loss
Time & Work
Time & Distance
Simple Interest & Compound Interest
Mensuration: Area & Volumes
Mr. A is a computer programmer. He is assigned three jobs for which time allotted is in the ratio of 5 : 4 : 2 (job are needed to be done individually). But due to some technical snag, 10% of the time allotted for each job gets wasted. Thereafter, owing to the lack of interest, he invests only 40%, 30%, 20% of the hours of what was actually allotted to do the three jobs individually. Find how much percentage of the total time allotted is the time invested by A.
Answer: (b)
Let the initial times allotted be : 50, 40 and 20 hours.
Then, the time used in each activity is:
20, 12 and 4 hours. Thus, 36 hours out of 110 are used in all.
Hence, the answer is 36/110 = 32.72%
A water pipe is cut into two pieces. The longer piece is 70% of the length of the pipe. By how much percentage is the longer piece longer than the shorter peice?
Answer: (a)
Percentage of longer pipe as compare to shorter pipe
= ${70 - 30}/30 × 100 = 40/30 × 100 = 400/3%$
If the radius of a circle is diminished by 10%, the area is diminished by
Answer: (b)
If the radius is diminised by r %, then
Area is diminished by $(2r - r^2/100) %$
= $2 × 10 - 10^2/100 = 19 %$
A shopkeeper employed a servant at a monthly salary of Rs. 1500. In addition to it, he agreed to pay him a commission of 15% on the monthly sale. How much sale in Rupees should the servant do if he wants his monthly income as Rs. 6000?
Answer: (b)
Servant's commission amount
= 6000 – 1500 = Rs. 4500
i.e., 15% = 4500
or, 100% = $4500/15$ ×100 = Rs. 30000
On a test containing 150 questions carrying 1 mark each, Mohan answered 80% of first 75 questions correctly. What percent of the other 75 questions does he need to answer correctly to score 60% in the examination ?
Answer: (d)
Total marks to score = ${150 × 60}/100$ = 90
Marks obtained in first 75 questions
= ${75 × 1 × 80}/100$ = 60
∴ Marks to be obtained in next 75 questions = 90 – 60 = 30
∴ % of questions to be answered correctly
= $({30 × 1 × 100}/75)$ % = 40%
ssc chsl tier 1 2023 IMPORTANT QUESTION AND ANSWERS
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