Q. A sum of money is invested at a certain rate of simple interest. If the interest earned in 4 years is $200, what will be the interest earned in 10 years at the same rate?
A.
$400
B.
$500
C.
$600
D.
$800
Solution
If $200 is earned in 4 years, then in 1 year, it earns $50. Therefore, in 10 years, it will earn $500.
Q. A survey found that 80% of people who meditate report lower stress levels. What can be inferred from this survey?
A.
Meditation is the only way to reduce stress.
B.
People with lower stress levels are more likely to meditate.
C.
Meditation may help in reducing stress levels.
D.
All people who meditate experience low stress.
Solution
The survey indicates a potential benefit of meditation in reducing stress, but does not imply that it is the only method or that all meditators experience low stress.
Correct Answer:
C
— Meditation may help in reducing stress levels.
Q. A survey indicates that people who consume more fruits and vegetables report better health. What can be inferred?
A.
Eating fruits and vegetables causes better health.
B.
People with better health tend to eat more fruits and vegetables.
C.
All healthy people eat fruits and vegetables.
D.
Fruits and vegetables are the only factors affecting health.
Solution
The survey shows a correlation between fruit and vegetable consumption and reported health, suggesting that healthier individuals may be more inclined to eat them.
Correct Answer:
B
— People with better health tend to eat more fruits and vegetables.
Q. A teacher has 48 pencils and 60 erasers. She wants to distribute them equally among students. What is the maximum number of students she can distribute to? (2023)
A.
12
B.
6
C.
8
D.
10
Solution
The HCF of 48 and 60 is 12, which is the maximum number of students she can distribute to equally.
Q. A teacher has an average score of 85 for her class of 20 students. If one student scores 95, what will be the new average if the class size increases to 21? (2023)
A.
84
B.
85
C.
86
D.
87
Solution
Total score = 85 × 20 + 95 = 1700 + 95 = 1795. New average = 1795 / 21 = 85.95, which rounds to 86.
Q. A teacher has an average score of 85 in her class of 20 students. If one student scores 95, what will be the new average if the student is removed from the class? (2023)
A.
84
B.
85
C.
86
D.
87
Solution
Total score = 85 × 20 = 1700. New total score = 1700 - 95 = 1605. New average = 1605 / 19 = 84.47, which rounds to 84.
Q. A teacher has an average score of 85 in her class. If she adds a new student who scores 95, how will the average change if the class size increases from 10 to 11?
A.
Remains the same
B.
Increases
C.
Decreases
D.
Cannot be determined
Solution
Current total score = 85 × 10 = 850. New total score = 850 + 95 = 945. New average = 945 / 11 = 85.91, which increases the average.
Q. A train travels from City A to City B at a speed of 60 km/h and returns at a speed of 90 km/h. What is the average speed of the train for the entire journey?
