Q. In a race, the average speed of a runner is 10 km/h. If he runs for 2 hours and then walks for 1 hour at 5 km/h, what is his average speed for the entire journey?
A.
8 km/h
B.
9 km/h
C.
10 km/h
D.
11 km/h
Solution
Distance covered while running = 10 km/h × 2 h = 20 km. Distance covered while walking = 5 km/h × 1 h = 5 km. Total distance = 25 km, total time = 3 h. Average speed = 25 km / 3 h = 8.33 km/h.
Q. In a survey, 60% of the participants preferred Brand A over Brand B. If 240 participants preferred Brand B, how many participants were surveyed in total?
A.
400
B.
600
C.
800
D.
1000
Solution
Let the total number of participants be x. According to the problem, 40% of x = 240. Therefore, x = 240 / 0.4 = 600.
Q. In a survey, 60% of the participants preferred Brand A over Brand B. If 240 participants preferred Brand A, how many participants were surveyed in total? (2023)
A.
400
B.
480
C.
600
D.
720
Solution
Let the total number of participants be x. According to the problem, 60% of x = 240. Therefore, x = 240 / 0.6 = 400.
Q. In a survey, the average age of a group of people is 30 years. If one person aged 40 leaves the group, what will be the new average age if the group originally had 10 people? (2023)
A.
28
B.
29
C.
30
D.
31
Solution
New total age = (30 × 10) - 40 = 260. New average = 260 / 9 = 28.89, which rounds to 29.
Q. In a survey, the average age of a group of people is 40 years. If one person aged 60 leaves the group, what will be the new average age if the group originally had 10 people?
A.
38
B.
39
C.
40
D.
41
Solution
Total age = 40 × 10 = 400. New total age = 400 - 60 = 340. New average = 340 / 9 = 37.78, which rounds to 38.
Q. In a survey, the average age of a group of people is 40 years. If one person aged 60 leaves the group, what will be the new average age if the group originally had 10 members? (2023)
A.
38
B.
39
C.
40
D.
41
Solution
Total age = 40 × 10 = 400. New total age = 400 - 60 = 340. New average = 340 / 9 = 37.78, which rounds to 38.
Q. The average of a set of numbers is 50. If one number is removed, the average becomes 48. What was the number that was removed?
A.
50
B.
52
C.
54
D.
56
Solution
Let the number of items be n. Total sum = 50n. After removing one number, the new sum = 48(n - 1). Setting up the equation gives the removed number as 52.
Q. The ratio of the number of cats to dogs in a shelter is 4:3. If there are 28 cats, how many dogs are there?
A.
21
B.
24
C.
18
D.
20
Solution
The ratio of cats to dogs is 4:3. If there are 28 cats, we can set up the proportion: 4/3 = 28/x. Solving for x gives us x = 21. Therefore, there are 21 dogs.
Arithmetic is a fundamental branch of mathematics that plays a crucial role in academic success. Mastering arithmetic concepts is essential for students preparing for school exams and competitive tests. Practicing MCQs and objective questions not only enhances understanding but also boosts confidence, leading to better scores in exams. Engaging with practice questions helps identify important questions and reinforces key concepts necessary for effective exam preparation.
What You Will Practise Here
Basic operations: Addition, subtraction, multiplication, and division
Fractions and decimals: Conversions and calculations
Percentage calculations: Understanding and applying percentage concepts
Ratio and proportion: Solving problems involving ratios and proportions
Average: Calculating mean, median, and mode
Word problems: Translating real-life situations into mathematical expressions
Time and work: Understanding concepts related to time, speed, and efficiency
Exam Relevance
Arithmetic is a key topic in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect to encounter arithmetic questions in multiple-choice formats, often focusing on real-world applications and problem-solving. Common question patterns include direct calculations, word problems, and application of formulas, making it essential for students to be well-versed in this area to excel in their exams.
Common Mistakes Students Make
Misunderstanding the order of operations, leading to incorrect answers
Confusing fractions and decimals during conversions
Overlooking key details in word problems, resulting in wrong interpretations
Neglecting to simplify expressions before solving
Failing to apply percentage formulas correctly in practical scenarios
FAQs
Question: What are some effective strategies for solving arithmetic MCQs? Answer: Focus on understanding the concepts, practice regularly, and learn to identify keywords in questions that guide you to the correct approach.
Question: How can I improve my speed in solving arithmetic problems? Answer: Regular practice with timed quizzes and mock tests can significantly enhance your speed and accuracy in solving arithmetic problems.
Start your journey towards mastering arithmetic today! Solve practice MCQs and test your understanding to ensure you are well-prepared for your exams. Remember, consistent practice is the key to success!
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