Question

the mean of 3 numbers ABC is 8 and the mean of 5 numbers a b c d and e is 15 find the mean of D and e​

Answer 1

Answer:

25.5

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Step-by-step explanation:

Mean of a, b, c is 8

=>  ( a + b + c ) / 3 = 8

=>  a + b + c = 24          ... (1)

Mean of a, b, c, d, e is 15

=> ( a + b + c + d + e ) / 5 = 15

=>  a + b + c + d + e = 75          ... (2)

Subtracting equation (1) from equation (2) gives

d + e = 75 - 24 = 51

=> ( d + e ) / 2 = 25.5

=> the mean of d and e and 25.5

Answer 2

Answer:

25.5 is the final answer.

Step-by-step explanation:

1) Mean of 3 no.

i) => $\frac{(a + b + c)}{3} = 8$

ii) =>  $a + b + c = 8 * 3 = 24$

2) Mean of 5 no.

i) => $\frac{( a + b + c + d + e )}{5} = 15$

ii) =>  $a + b + c + d + e = 15 * 5 = 75$

3) Subtracting equation (1) from equation (2) gives us

i) => $\frac{(d+e)}{2} = 75 - 24 = 51$

ii) => $d + e = \frac{51}{2} = 25.5$

FINAL ANSWER - the mean of d and e and 25.5

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