Average MCQs Math MCQs - Maths Practice | PakExamPoint

Practise Average MCQs Math MCQs in Maths. Attempt multiple-choice questions, check answers and revise related subtopics.

Average MCQs Math MCQs and revision practice

Study Average MCQs Math through multiple-choice questions in Maths. This subtopic contains 480 practice questions. Read the wording carefully, compare the options and attempt an answer before checking the solution in learning mode.

Use these Average MCQs Math MCQs to identify the facts, rules or methods you need to revise. Where an explanation is available, work through it and write down why your chosen option was correct or incorrect. Revisit difficult questions after reviewing your notes, then use exam mode for timed practice.

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Average MCQs Math: questions and answer review

Try each question before opening its answer. Record the concept behind each mistake and revisit it during your next practice session.

31. If 20 men can do a piece of work in 8 days, then how many men can finish the same work in 10 days?

Check answer and explanation

Answer: 16

Explanation 20 men complete the work in 8 days Total work = 20 men * 8 days = 160 man-days Now, to complete the work in 10 days: 160 man-days / 10 days = 16 men

32. If you write down all number from 1 to 100 how many times would you write 3

اگر آپ 1 سے 100 تک تمام نمبر لکھتے ہیں تو آپ کتنی بار3 لکھیں گے

Check answer and explanation

Answer: 20

Explanation To find how many times digit 3 appears from 1 to 100, count how often it appears in: 1. Units place: Numbers with 3 in units place: 3, 13, 23, 33, 43, 53, 63, 73, 83, 93 → 10 times 2. Tens place: Numbers with 3 in tens place: 30–39 → 10 times 3. Total: 10 (units) + 10 (tens) = 20 times SH18-8-2023

33. If the ages of 3 persons are 17, 16, and 12, and another person is added making the average age 20, what is the age of the new person?

Check answer and explanation

Answer: 35

Explanation Total of 3 ages = 17 + 16 + 12 = 45 New average = 20, for 4 people → Total = 20 × 4 = 80 Age of 4th person = 80 − 45 = 35

34. The ratio between the perimeter and the breadth of a rectangle is 5:1. If the area of the rectangle is 216 sq. cm, what is the length of the rectangle?

Check answer and explanation

Answer: 18 cm

Explanation ND06-08-2023

35. Marey's is four times the age of her brother. Her age will be twice her brother's when he is:

Check answer and explanation

Answer: 15 years old

Explanation

36. Sam bought a 12 pack of soda for $5.40. How much did he pay per can of soda?

Check answer and explanation

Answer: $0.45

Explanation To find the price per can: Total cost = 5.40 Number of cans = 12 Price per can = 5.40 ÷ 12 = 0.45

37. Simple interest on a certain sum is 16/25 of the sum. The rate per cent if the rate per cent and time (in years) are equal, is interest?

Check answer and explanation

Answer: 8%

Explanation Let sum = X. Then S.I = 16x/25 Let rate = R% and Time = R years. Therefore, (x * R * R)/100 = 16x/25 => R = 40/5 = 8 Therefore, Rate = 8% and Time = 8 years.

38. The tank full of petrol in Haroon’s motorcycle lasts for 10 days, if he starts using 25% more every day for how many days will the tank full of petrol last?

Check answer and explanation

Answer: 8 days

Explanation Let us assume that Haroon uses X units of petrol everyday. So the amount of petrol in the tank when it is fuel will be 10X. If he started using 25% more petrol every day, then the amount of petrol he how uses everyday will be X (1 +25/100) =1.25x Therefore, number of days his petrol will how last = Amount of petrol in tank / amount of petrol used everyday = 10x/1.25x = 10/1.25 = 8 Days

39. The average age was 17 years of a family of 5 members, 3 years ago. A new baby has been born, what is the age of the new baby if the average age of the family is the same baby?

Check answer and explanation

Answer: 2 year

Explanation So, now we know that the average age of 5 members of a family 3 years ago is 17 years. So, the sum of the ages of all members of the family 3 years ago will be (average age)*5. The sum of the ages of the five members of the family 3 years ago will be 17*5 = 85 years. As we know, now the age of all 5 members of the family should be 3 more than the age they had 3 years ago. So, now the sum of the ages of the five members of the family should be 85 + 3*5 = 100. But as we know that in three years a baby has also been born in the family. Let the baby be born x years ago. So, the current age of the baby will be x years. So, now the sum of the present age of all members of the family including the baby will be the sum of the ages of 5 members + the sum of the ages of the baby. So, today the sum of the ages of all 6 members of the family will be (100 + x) years. Now as we are given that today the average age of the family is also 17 years. So, the average age of the family is = Sum of the age of all members of the family / total number of members in a family So, 17 = 100 + x6 Now, cross-multiplying the above equation to get the value of x. 17*6 = 100 + x 102 = 100 + x So, x = 102 – 100 = 2 years. ND29-5-2023

40. The average of runs of a cricket player in 10 innings was 33. How many runs must he make in his next innings so as to increase his average of runs by 3?

Check answer and explanation

Answer: 66

Explanation - The player's average runs in 10 innings is 33, so the total runs scored by the player in 10 innings is: 33 x 10 = 330 runs - To increase the average by 3, the new average will be: 33 + 3 = 36 - Since the player has already played 10 innings, the total number of innings now becomes 11 (including the next innings). - Let x be the runs scored in the next innings. The new total runs will be: 330 + x - The new average is 36, so we can set up the equation: (330 + x) / 11 = 36 - Solve for x: 330 + x = 396 x = 66 So, the player needs to score 66 runs in the next innings to increase the average by 3.

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