How to practice Quantitative Aptitude

Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.

Questions 1–10 of 56. Imported answers require independent review unless marked reviewed.

Topic practice 56 questionsPage 1 of 6

Question 10

Open question
GAMCQ2 marksNeeds review
Circles

,

, and

, with centers

,

, and

, and radii

,

, and

, respectively, touch each other as shown in the following figure. Given

cm,

cm and the angle

is

,

_____ cm.
Diagram for Mathematics question 10

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Question 3

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GAMCQ1 markNeeds review
The average marks obtained by a class in an examination were calculated as 30.8. However, while checking the marks entered, the teacher found that the marks of one student were entered incorrectly as 24 instead of 42. After correcting the marks, the average becomes 31.4. How many students does the class have?
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Question 7

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In the diagram, the lines QR and ST are parallel to each other. The shortest distance between these two lines is half the shortest distance between the point P and line QR. What is the ratio of the area of the triangle PST to the area of the trapezium SQRT?
Note: The figure shown is representative.
Diagram for Mathematics question 7

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Question 8

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A fair six-faced dice, with the faces labelled ‘1’, ‘2’, ‘3’, ‘4’, ‘5’, and ‘6’, is rolled thrice. What is the probability of rolling ‘6’ exactly once?
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Question 10

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A shop has 4 distinct flavors of ice-cream. One can purchase any number of scoops of any flavor. The order in which the scoops are purchased is inconsequential. If one wants to purchase 3 scoops of ice-cream, in how many ways can one make that purchase?
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Question 3

Open question
GAMCQ1 markNeeds review
A student was supposed to multiply a positive real number

with another positive real number

. Instead, the student divided

by

. If the percentage error in the student’s answer is 80%, the value of

is
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Question 4

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If the sum of the first 20 consecutive positive odd numbers is divided by

, the result is
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Question 5

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The ratio of the number of girls to boys in class VIII is the same as the ratio of the number of boys to girls in class IX. The total number of students (boys and girls) in classes VIII and IX are 450 and 360, respectively. If the number of girls in classes VIII and IX is the same, then the number of girls in each class is
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Question 8

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The plot below shows the relationship between the mortality risk of cardiovascular disease and the number of steps a person walks per day. Based on the data, which one of the following options is true?
Diagram for Mathematics question 8

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Question 3

Open question
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A ‘frabjous’ number is defined as a 3 digit number with all digits odd, and no two adjacent digits being the same. For example, 137 is a frabjous number, while 133 is not. How many such frabjous numbers exist?
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