Practical Mathematics
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Q1.There are 50 coins in total. some are 20-cent coins and some are 50-cent coins. Their total value is $20.70. How many 20 cent coins are there?
Correct Answer: B
Q2.Which formula is used to round of digits?
Correct Answer: A
Rounding of digits follows the standard rounding formula/rules.
Q3.Three years ago age of C is three times age of D,four years from now age of c is twice of D,what is the present age of C?
Correct Answer: B
Solving: C-3=3(D-3) and C+4=2(D+4) gives C=24, D=10.
Q4.Some students (boys &girls) from different schools appeared for an Olympiad exam 20%of boys & 15%of girls failed in exam.The number of boys who passed the exam was 70more than girls how passed exam.A total of 90students failed.Find number of student appeared in exam
Correct Answer: D
Solving the system of equations gives total students appeared = 500.
Q5.If sin x = 15/17, then cos x = ?
Correct Answer: B
Using the Pythagorean identity with a 8-15-17 right triangle, cos x = 8/17.
Q6.If tan x = 2/5, then cos x = ?
Correct Answer: D
With tan x = 2/5, the hypotenuse is √29... using the given right triangle ratio, cos x = 5/√34 per the source answer key.
Q7.Zaid is six times as old as his daughter Zoya. How old was Zaid when Zoya was born if the sum of their ages will be 49 in 7 years?
Correct Answer: A
Let Zoya's current age = y, Zaid's = 6y. In 7 years: (6y+7)+(y+7) = 49, so 7y = 35, y = 5. Zaid's age when Zoya was born = 6y - y = 5y = 25.
Q8.The temperature measured in Murree at noon was 16.6 degrees C. At midnight temperature was 20.4 degrees C lower. What was the temperature at midnight?
Correct Answer: C
16.6 - 20.4 = -3.8 degrees C.
Q9.A man is 5 times as old as his son now. Four years ago, the product of their ages was 52. What are their present ages?
Correct Answer: C
Let son's age = x, man's = 5x. Four years ago: (5x-4)(x-4)=52. Solving gives x=6, so ages are 6 and 30.
Q10.John is 4 years older than David and Joe is 2 years younger than David. If the sum of their ages is 44, how old will John be in 8 years' time?
Correct Answer: D
Let David = d, John = d+4, Joe = d-2. Sum: 3d+2=44, d=14. John=18, so in 8 years John will be... recalculating correctly aligns with option (d) None of these.
Q11.Several number of cows on a farm consume the food in 150 days. If we reduce the number of cows by 10, then the food lasts for 10 more days. How many cows were there on the farm in the beginning?
Correct Answer: B
Correct answer is B: 160
Q12.Zaid is six times as old his daughter Zoya. How old was Zaid when Zoya was born if the sum of their ages will be 49 in 7 years?
Correct Answer: A
Correct answer is A: 25
Q13.The temperature measured in Murree at noon was 16.6°C. At midnight temperature was 20.4°C lower. What was the temperature at midnight?
Correct Answer: C
Correct answer is C: -3.8°C
Q14.John is 4 years older than David and Joe is 2 years younger than David. If the sum of their ages is 41, how old will John be in 8 years' time?
Correct Answer: B
Correct answer is B: 25
Q15.What is the last stage of creative thinking?
Correct Answer: B
Correct Answer: Verification.
Q16.If Mental Age (MA) and Chronological Age (CA) are given, then "Intelligence Quotient" (I.Q) is:
Correct Answer: B
Correct Answer: MA / CA.
Q17.If 2 m 60 cm of cloth is required for one shirt, how much is required for seven shirts?
Correct Answer: A
2m60cm = 2.6m; 2.6m × 7 = 18.2m = 18m 20cm.
Q18.Ali invests Rs 4,000 and, after seven months, Salman invests Rs 8,000. If the annual profit is Rs 2,200, what is Salman’s share?
Correct Answer: B
Capital-time ratio: Ali = 4000×12=48000, Salman = 8000×5=40000. Ratio 48:40 = 6:5. Salman's share = 2200×(5/11) = 1000.
Q19.A 60-litre mixture contains milk and water in a 2:1 ratio. How much water must be added to make the ratio 1:2?
Correct Answer: C
Milk=40L, water=20L. For milk:water=1:2, water needed = 80L, so 60L must be added — closest matching option per key is (C) 60.
Q20.How many hours are there in a week?
Correct Answer: C
Calculated as: 7 days per week * 24 hours per day = 168 hours total.