Question
A person rings a metallic bell near a strong concrete
wall. He hears the echo after 0.3 s. if the sound moves with a speed of 340 m/s, how far is the wall from him?ĀSolution
Ā Let the distance is x metre. Distance = Velocity Ć Time x = 340 Ć 0.3 = 102 metre (This is the total distance)Ā 
The mode and the mean of grouped data are 25 and 29.5 respectively. Find the median, correct to two places of decimal, using empirical relation.
Find the sum of geometric progression, 40, 20, 10, 5, …..
What is the sum of the first 14 terms of an arithmetic progression if the first term is -21 and last term is 40?
The data given below shows the marks obtained by 12 different students in an exam.
Marks obtained: 18, 22, 25, 28, 35, 39, 47, 50, 50, 64, 65, 85...
The sum to n terms of the series 1 + 1 + 3 + 1 + 3 + 5 + 1 + 3 + 5 + 7 …………………… is
The 5th and 8th term of an arithmetic progression are 13 and -5 respectively. What is the 15th term?
The number of terms needed to get Sn = 0 in the A.P of 63, 60, 57. . . . .
Which of the following statement(s) is/are correct?
(I) The area of a parallelogram with a base of ...
The arithmetic mean and geometric mean of two numbers are 7 and 2ā10 respectively, then find the numbers.
If p = q + 2, where q is the product of six consecutive positive integers, then which of the following is/are true?Ā Ā
a. p is a perfect cube
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