Question
The mean of a set of 15 numbers is 40. If the mean of
the initial 5 numbers in this set is represented by the expression (12x + 10), and the mean of the subsequent 10 numbers is given by (7x - 10), calculate the value of 'x'.Solution
Sum of first all 15 numbers = 40 X 15 = 600 Sum of first 5 numbers = 5 X (12x + 10) = (60x + 50) Sum of last 10 numbers = 10 X (7x - 10) = (70x - 100) So, we have 600 = 60x + 50 + (70x - 100) = 130x - 50 So, 130x = 600 + 50 = 650 So, x = (650/130) = 5 Therefore, the value of 'x' is 5.
How many floors are there between H and C?
Seven boxes T, E, V, W, X, Y and Z are kept one above another. W is three boxes above Y. There are two boxes between W and Z. T is immediately above V. ...
Which of the following statements is true?
Four of the following five are alike in a certain way and hence form a group. Find the one that doesn’t belong to that group.Â
Which of the following box is kept just below the box which contains Push – pin?
If M is related to R, R is related to P then Q is related to?
What is the position of R with respect to T?
Which of the following statements is/are true regarding C?
I) C likes Watermelon
II) C lives on the second floor
III) C lives in flat B
IV) C likes Guava
On which of the following shelf number does Box G is kept from the top?
Who is living on the floor numbered 3rd?
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