Mandy knows that a 5 meter long metal bar has a mass of 40 kg. mandy wants to figure out the mass (w) of a bar made out of the same metal that is 3 meters king and the same thickness.

w = 24

Step-by-step explanation:

If a 5 meter long metal bar has a mass of 40kg, this means a 1 meter long metal bar has a mass of 8kg because 40kg/5m = 8. So, 1 meter long metal bar is 8kg. This means a 3 meter long metal bar has a mass of 24kg because 8 * 3 = 24.

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its 4 because 2 times 2 is 4, if you double the number two you get four