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What is the value of 0  1 + 2  3 + 4  5 + 6  7 ...........  17 + 18  19 + 20?
0  1 + 2  3 + 4  5 + 6  7......  17 + 18  19 + 20
= 0 + (1 + 2) + (3 + 4) + (5 + 6) + ...... + (17 + 18) + (19 + 20)
= 0 + 1 + 1 + ...... + 1 + 1 = 10
In a box, (3/4)^{th} of the balls are red, (1/6)^{th} are white and the rest are blue. If there are 3 blue balls in the box, how many are red?
Fraction for blue balls
Blue balls = 3 {given}.
Now, 1/12 of total balls = 3
⇒ Total number of balls = 3 x 12 = 36
Hence, number of red balls = (3/4)^{th} of 36
An insect crawls up 5 cm every second on a 60 cm vertical rod and then falls down 2 cm over the next second. How many seconds will it take to climb the rod?
Distance covered in 1st second = 5 cm
Distance covered in 2nd second =  2 cm
∴ Total distance covered in two seconds
= 5  2 = 3 cm
Time taken in climb distance of 3 cm = 2 secs
Distance climbed by insect in 38 secs.
= 38/2 x 3 = 57cm
Distance covered in 39th secs
= 57 + 5
= 62 cm
Which is more than the rod height.
Hence, insect will climb the rod in 39 sec.
Calculate the value of
Directions: The total sales of a company (in crores) for different years are given in the following bar graph. Study the bar graph carefully and answer the following question.
Q. In which year the sales of the company was maximum?
Directions: The total sales of a company (in crores) for different years are given in the following bar graph. Study the bar graph carefully and answer the following question.
Q. In which year the sales of the company was minimum?
Directions: The total sales of a company (in crores) for different years are given in the following bar graph. Study the bar graph carefully and answer the following question.
Q. The percentage decrease in total sales in year 2009 to that in year 2008 is:
Sales in year 2008 = 50
Sales in year 2009 = 30
Difference = 50  30 = 20
∴ Percentage decrease = 20/50 x 100 = 40%
Directions: The total sales of a company (in crores) for different years are given in the following bar graph. Study the bar graph carefully and answer the following question.
Q. The average sales during these five years is:
Average sales
Directions: The total sales of a company (in crores) for different years are given in the following bar graph. Study the bar graph carefully and answer the following question.
Q. The ratio of the total sales in the year 2005 to that in the year 2009 is:
Find the mean of the following distribution.
63 tests

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