Question

there are four unknown numbers the mean of first two numbers is 4 and the mean of first three numbers is 9 the mean of all four numbers is 15 if one of the four numbers is 2 find the other numbers ​

Answer 1

Answer:

The required numbers are 2,6,19 and 33.

Step-by-step explanation:

Given : There are four unknown numbers.The mean of first two number is four and the mean of the first three is 9.The mean of all four numbers is 15,if one of the four number is 2.

To find : The other number ?

Solution :

Let the numbers be p,q,r and s.

According to question,

The mean of first two number is four and the mean of the first three is 9.The mean of all four numbers is 15.

i.e.

.....(1)

......(2)

 ......(3)

If one of the four number is 2 so we let p=2,

Substitute in equation (1),(2) and (3).  

In equation (1),

In equation (2),

In equation (3),

Therefore, The required numbers are 2,6,19 and 33.

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