percentage Model Questions & Answers, Practice Test for ssc cgl tier 2
Last year there were 610 boys in a school. The number decreased by 20 percent this year. How many girls are there in the school if the number of girls is 175 percent of the total number of boys in the school this year ?
Answer: (c)
No. of boys this year = 610 × 80% = 488
No. of girls = 488 × 175% = 854
41% of 601 – 250.17 = ? – 77% of 910
Answer: (d)
41% of 601 – 250.17 = ? – 77% of 910
≈ 246 – 250 = ? – 701
≈ 701 + 246 – 250 = ?
≈ 700 = ?
Yesterday Priti typed an essay of 5000 words at the speed of 60 words per minute. Today she typed the same essay faster and her speed was 15% more than yesterday. What is the approximate difference in the time she took to type yesterday and the time she took to type today?
Answer: (b)
Time taken yesterday = $\text"No.of words typed"/\text"Typing speed"$
= $5000/60$ = 83.33mins.
Speed today = 60 × 115% = 69
Time taken = $5000/69$ = 72.46mins
Diff. = 83.33 – 72.46
= 10.87 or approx 10 minutes
The price of an article X increases by 20% every year and price of article Y increases by 10% every year. In the year 2010, the price of article X was Rs.5000 and price of article Y was Rs.2000. In which year the difference in their prices exceeded Rs.5000 for the first time ?
Answer: (a)
| X | Y | |
| 2010 | 5000 | 2000 |
| 2011 | 6000 | 2200 |
| 2012 | 7200 | 2420 |
| 2013 | 8640 | 2662 |
Difference in price in 2013
= 8640 – 2662 = 5978>5000
The digit at unit place of a two-digit number is increased by 100% and the digit at ten place of the same number is increased by 50%. The new number thus formed is 19 more than the original number. What is the original number ?
Answer: (e)
Working with options, we have
| Original number | New number | Difference | |
| a | 22 | 34 | 12 |
| b | 63 | 96 | 33 |
| c | 24 | 38 | 14 |
| d | 25 |
Obviously, (e) is the correct option.
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