# CAT 2021 Question Paper Slot 1 | CAT Quants

Complete Paper Solution

**Solution 1**

**F(x)= \frac{x^{2} + 2x – 15}{x^{2} – 7x – 18} is negative if and only if**

Video Explanation :

Correct Answer : Choose “A”

**Solution 2**

**The number of integers n that satisfy the inequalities |n – 60| < |n – 100| < |n – 20| is**

Video Explanation :

Correct Answer: Choose “D”

**Solution 3**

**Identical chocolate pieces are sold in boxes of two sizes, small and large. The large box is sold for twice the price of the small box. If the selling price per gram of chocolate in the large box is 12% less than that in the small box, then the percentage by which the weight of chocolate in the large box exceeds that in the small box is nearest to**

Video Explanation :

Correct Answer : Choose “A”

**Solution 4**

**If 5 – \log _{10}\sqrt{1 + x }+ 4 \log _{10}\sqrt{1 – x} = \log _{10}\frac{1}{\sqrt{1 – x^{2}}} then 100 x equals [TITA]**

Video Explanation :

Correct Answer : “99”

**Solution 5**

**A basket of 2 apples, 4 oranges and 6 mangoes costs the same as a basket of 1 apple, 4 oranges and 8 mangoes, or a basket of 8 oranges and 7 mangoes. Then the number of mangoes in a basket of mangoes that has the same cost as the other baskets is**

Video Explanation :

Correct Answer: Choose “B”

**Solution 6**

**If the area of a regular hexagon is equal to the area of an equilateral triangle of side 12 cm, then the length, in cm, of each side of the hexagon is**

Video Explanation :

Correct Answer : Choose “C”

**Solution 7**

**Onion is sold for 5 consecutive months at the rate of Rs 10, 20, 25, 25, and 50 per kg, respectively. A family spends a fixed amount of money on onion for each of the first three months, and then spends half that amount on onion for each of the next two months. The average expense for onion, in rupees per kg, for the family over these 5 months is closest to**

Video Explanation :

Correct Answer : Choose “A”

**Solution 8**

**If r is a constant such that |x² – 4 x – 13| = r has exactly three distinct real roots, then the value of r is**

Video Explanation :

Correct Answer : Choose “C”

**Solution 9**

**Amal purchases some pens at ₹ 8 each. To sell these, he hires an employee at a fixed wage. He sells 100 of these pens at ₹ 12 each. If the remaining pens are sold at ₹ 11 each, then he makes a net profit of ₹ 300, while he makes a net loss of ₹ 300 if the remaining pens are sold at ₹ 9 each. The wage of the employee, in INR, is [TITA]**

Video Explanation :

Correct Answer : “1000”

**Solution 10**

**Anil invests some money at a fixed rate of interest, compounded annually. If the interests accrued during the second and third year are ₹806.25 and ₹ 866.72, respectively, the interest accrued, in INR, during the fourth year is nearest to**

Video Explanation :

Correct Answer : Choose “A”

**Solution 11**

**The strength of an indigo solution in percentage is equal to the amount of indigo in grams per 100 cc of water. Two 800 cc bottles are filled with indigo solutions of strengths 33% and 17%, respectively. A part of the solution from the first bottle is thrown away and replaced by an equal volume of the solution from the second bottle. If the strength of the indigo solution in the first bottle has now changed to 21% then the volume, in cc, of the solution left in the second bottle is [TITA]**

Video Explanation :

Correct Answer : “200”

**Solution 12**

**Amar, Akbar and Anthony are working on a project. Working together Amar and Akbar can complete the project in 1 year, Akbar and Anthony can complete in 16 months, Anthony and Amar can complete in 2 years. If the person who is neither the fastest nor the slowest works alone, the time in months he will take to complete the project is [TITA]**

Video Explanation :

Correct Answer : “32”

**Solution 13**

**The number of groups of three or more distinct numbers that can be chosen from 1, 2, 3, 4, 5, 6, 7 and 8 so that the groups always include 3 and 5, while 7 and 8 are never included together is [TITA]**

Video Explanation :

Correct Answer : “47”

**Solution 14**

**A circle of diameter 8 inches is inscribed in a triangle ABC where ∠ABC = 90°. If BC = 10 inches then the area of the triangle in square inches is [TITA]**

Video Explanation :

Correct Answer : “120”

**Solution 15**

**Suppose the length of each side of a regular hexagon ABCDEF is 2 cm. It T is the mid point of CD, then the length of AT, in cm, is**

Video Explanation :

Correct Answer : Choose “B”

**Solution 16**

**Suppose hospital A admitted 21 less Covid infected patients than hospital B, and all eventually recovered. The sum of recovery days for patients in hospitals A and B were 200 and 152, respectively. If the average recovery days for patients admitted in hospital A was 3 more than the average in hospital B then the number admitted in hospital A was [TITA]**

Video Explanation :

Correct Answer : “35”

**Solution 17**

**The amount Neeta and Geeta together earn in a day equals what Sita alone earns in 6 days. The amount Sita and Neeta together earn in a day equals what Geeta alone earns in 2 days. The ratio of the daily earnings of the one who earns the most to that of the one who earns the least is**

Video Explanation :

Correct Answer : Choose “B”

**Solution 18**

**The natural numbers are divided into groups as (1), (2, 3, 4), (5, 6, 7, 8, 9), ….. and so on. Then, the sum of the numbers in the 15th group is equal to**

Video Explanation :

Correct Answer : Choose “A”

**Solution 19**

**Anu, Vinu and Manu can complete a work alone in 15 days, 12 days and 20 days, respectively. Vinu works everyday. Anu works only on alternate days starting from the first day while Manu works only on alternate days starting from the second day. Then, the number of days needed to complete the work is**

Video Explanation :

Correct Answer : Choose “D”

**Solution 20**

**How many three-digit numbers are greater than 100 and increase by 198 when the three digits are arranged in the reverse order? [TITA]**

Video Explanation :

Correct Answer : “70”

**Solution 21**

**Two trains cross each other in 14 seconds when running in opposite directions along parallel tracks. The faster train is 160 m long and crosses a lamp post in 12 seconds. If the speed of the other train is 6 km/hr less than the faster one, its length, in m, is**

Video Explanation :

Correct Answer : Choose “C”

**Solution 22**

**If x_{0} = 1, x_{1} = 2 , and x_{n+2} = \frac{1 + x_{n+1}}{x_{n}} , n = 0 , 1 , 2 , 3 , … , then x_{2021} is equal to?**

Video Explanation :

Correct Answer : Choose “D”