CBSE - Aptitude Mathematics

Which of the following is not true about harmonic mean? 1.it utilizes all the items of the data 2.it lends itself to algebraic calculation 3.it is not easily calculated 4.it can be obtained by inspection

A person on tour has Rs.360 for his daily expenses. If he extends his tour for 4 days, he has to cut his daily expenses by Rs.3. Find the original duration of the tour. 1. 15 days 2. 30 days 3. 20 days 4. 24 days

The existence of the unique solution of the system x+y+z=b, 2x+3y-z=6, 5x-y+az=10 depends on 1. b only 2. a only 3. a and b 4. neither a nor b

A man buys ball pens at the rate of 15 for Rs.12. To earn a profit of 20%, he should sell 1. 15 ball pens for Rs.16 2. 16 ball pens for Rs.15 3. 20 ball pens for Rs.22 4. 25 ball pens for Rs.24

The length, breadth and height of a room are 5 meter, 4 meter and 3 meter respectively. Find the area of the four walls. 1. 54 sq.m 2. 60 sq.m 3. 34 sq.m 4. 36 sq.m