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Solution to Problem 8
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In this lesson, we discuss the last problem of this mock test paper.

Riya Agarwal is teaching live on Unacademy Plus

Riya Agarwal
I'm here to liberate & share my knowledge. Shortly, all DI and LR lessons will be available, in English & Hindi. Also, past year papers.

Unacademy user
it was really very simple to understand and wud appreciate more vedios like this for dbms aswell
Could you please tell the percentile(marks ) that would be considered good in this test. My score is 65, I didn't solve, set 4/5, got 22 correct out of23
Riya Agarwal
7 months ago
That's a really good attempt and accuracy. Keep it up👍👍😊
MAM SCORE FOR MOCK TEST 1
  1. CAT DILR MOCKTEST 1


  2. ABOUT ME . I hold a B.E degree in Electronics & Communication Engineering. CAT, 17: DI & LR-98.29 %ile. . Follow me on the Unacademy learning app for all conceptual courses and practice papers on DI & LR topics for CAT and other B-school entrance exams: https://unacademy.com/userli riyaagarwal .Not all are born Einstein's but trust me with hard work and dedication we can together make it possible.


  3. SOLUTION


  4. PROBLEM 8


  5. DIRECTIONS FOR Q.29- Q32 Given below are the forecasts of the World and SA energy demand for the years 1970, 1980 and 990 AD and the forecast made for these years follows for the subsequent decade as well. For example, the forecast for 1980 means the forecast for years 1980-1989. The demand is given in million barrels per day, crude oil equivalent. 1970 1980 1990 World 50.0 30.0 50.0 0.0 0.0 150.0 SA 4.0 0.5 4.0 0.5 World 70.0 40.0 60.0 20.0 0.0 200.0 SA 0.0 2.5 5.0 World 80.0 50.0 75.0 25.0 20.0 250.0 33 SA 15.0 5.0 10.0 2.0 Total 10.0 20.0


  6. ANSWER THE FOLLOWING: Q29. Over I980 2000, which two fuels meet more than 60 percent of the total energy demand of both World and SA? (a) A&B (b) A&C (c) B&C (d) None Q30. Which fuel's proportion in the total energy demand increases over the decade 1970-1980 and decreases over the decade 1980 1990 for both the World and SA? (a) A (b) B (c) C (d) D Q31. Which is the fuel whose proportion to the total energy demand of the world will remain constant over the period 1970 - 1990 but whose proportion will increase in the total energy demand in SA? (a) C (b) D (c) E (d) B Q32 Which is the fuel whose proportion in the total energy demand will decrease continuously 1990, in S? over the period 1970 (a) B (b) C (c) D (d) E


  7. Q29. Over 1980 2000, which two fuels meet more than 60 percent of the total energy demand of both World and SA? (a) A&B (b) A&C (c) B&C (d) None 1970 1980 1990 World 50.0 30.0 50.0 0.0 10.0 150.0 SA 4.0 0.5 4.0 0.5 World 70.0 40.0 60.0 20.0 10.0 200.0 SA 0.0 2.5 5.0 World 80.0 50.0 75.0 25.0 20.0 250.0 SA 15.0 5.0 0.0 2.0 Total 10.0 20.0 33.3


  8. Q29. Over 1980 2000, which two fuels meet more than 60 percent of the total energy demand of both World and SA? (a) A&B (b) A&C (c) B&C (d) None Solution: For the answer choices given and for world we can make the following table. 1970 1980 WorldSA WorldSA WorldSA 150.0 0.0 200.0 20.0250.033.3 30.0 0.5 40.02550.0 5.0 1990 Total Value Proportion | 20% | 5% | 20% | 12.5%| 20% | 15.15% Value 50.0 4.0 60.0 5.0 75.00.0 Proportion l 33.3% | 40% | 30% | 25% | 30% | 30.3% Value 50.0 4.0 70.0 10.080.015.0 Proportion | 33.3% | 40% | 35% | 50% | 32% | 45.04% Thus we can see that C and A combined constitute more than 60% of total energy in both World & SA for the given period Answer: Option(b)


  9. Q30. Which fuel's proportion in the total energy demand increases over the decade 1970-1980 and decreases over the decade 1980 1990 for both the World and SA? (b) B (d) D 1970 1980 1990 World 50.0 30.0 50.0 0.0 10.0 150.0 SA 4.0 0.5 4.0 0.5 World 70.0 40.0 60.0 20.0 10.0 200.0 SA 0.0 2.5 5.0 World 80.0 50.0 75.0 25.0 20.0 250.0 SA 15.0 5.0 0.0 2.0 Total 10.0 20.0 33.3


  10. Q30. Which fuel's proportion in the total energy demand increases over the decade 1970-1980 and decreases over the decade 1980 1990 for both the World and SA? (b) B (d) D Solution: 1970 1980 1990 WorldSAWorld SA World SA 50.0 0.0200.0 20.0250.0 33.3 4.0 70.0 10.0 80.05.0 Total Value 50.0 Proportion | 33.3% | 40% | 35% | 50% | 32% | 45.04% Proportion | 20% | 5% | 20% | 12.5%| 20% | 15.15% Proportion | 33.3% | 40% | 30% | 25% | 30% | 30.3% Value 30.0 0.5 40.0 2.5 50.0 5.0 Value 50.0 4.0 60.0 5.0 75.0 0.0 Value 0.00.5 20.0.025.0 1.3 Proportion 6.67% | 5% | 10% | 5% | 10% | 3.9% As seen from the above table, A is the fuel whose proportion in the total energy demand increases during 1980-1990 and decreases during 1990-2000 for both world & SA. Answer: Option (a)