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3 years ago

14

A bag contains 2 steel balls and 5 brass balls. The total weight is 13 pounds. If 2 steel balls are added and 2 brass balls are

removed, the weight decreases to 12 pounds. How much does each kind of ball weigh?

1 answer:

puteri [66]3 years ago

8 0

Steel balls are 1.5 pounds, brass are 2 pounds

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We have a rectangle with length L that is 3 inches more than the width W. Then we can write this as:

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$\begin{gathered} A=180 \\ L\cdot W=180 \\ (W+3)\cdot W=180 \\ W^2+3W=180 \\ W^2+3W-180=0 \end{gathered}$

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The first one is not valid, as W has to be greater than 0.

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