Question

3 boxes have some average weight .when one box which weight 89kg is replaced by another box ,the average weight increases by 5kg .how much the new box weight​

Answer 1

The new box weight is 104.

Explanation:

Given:  

3 boxes have some average weight .when one box which weight 89 kg is replaced by another box, the average weight increases by 5 kg.

To find:  

How much the new box weight

Solution:  

Let the weight of each box be A, B, C, where initially C = 89

$\begin{array}{l}{\frac{A+B+89}{3}=X} \\ \\{A+B+89=3 X} \\ \\{A+B=3 X-89}\end{array}$

Also given, $\frac{A+B+C}{3}=X+5$

3X – 89 + C = 3X + 15

C = 104.

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Answer 2

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c=104

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