Magical Option Elimination Techniques | CAT 100%iler | Quants for CAT 25 | Sudhanshu Sir | Litmus

Описание: Following are the questions discussed, first attempt it yourself & then look at the solutions where Sudhanshu Sir ( QA 100%iler ) explains beautiful techniques to elimnate answer options.

1. In 2010, a library contained a total of 11500 books in two categories - fiction and non-fiction. In 2015, the library contained a total of 12760 books in these two categories. During this period, there was 10% increase in the fiction category while there was 12% increase in the non-fiction category. How many fiction books were in the library in 2015?

6600
6160
6000
5500

2. A cistern of capacity 40 litres has an inlet and an outlet pipe. When both the pipes are opened at once, it takes 8 minutes to fill the cistern. However, if the outflow rate is increased 1.5 times, the cistern never gets filled. Which of the following can be the outflow rate?

8 litres/minute
6 litres/minute
12 litres/minute
9 litres/minute

3. What is the sum of all 3-digit numbers that leave a remainder of ‘2’ when divided by 3?
(a) 530,820 (b) 179,587 (c) 560,758 (d) 164,850

4. What is the largest 4-digit number in the series 334, 343, 352….

a) 9991
b) 9993
c) 9995
d) 9997

5. An alloy of copper and aluminum has 40% copper. An alloy of Copper and Zinc has Copper and Zinc in the ratio 2: 7. These two alloys are mixed in such a way that in the overall alloy, there is more aluminum than Zinc, and copper constitutes x% of this alloy. What is the range of values x can take?

30% ≤ x ≤ 44%
32.5% ≤ x ≤ 42%
35% ≤ x ≤ 40%
32.25% ≤ x ≤ 40%

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