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9. Welding: A 10-ft bar of I-beam weighs 208 lb. What is the weight of a 6-ft length?

10. Photography: A photographer must mix a chemical in the ratio of 1 part chemical for every 7 parts of water.

Answer :

Final answer:

The weight of a 6-ft length of a 10-ft bar of I-beam is 124.8 lb.


Explanation:

To find the weight of a 6-ft length of a 10-ft bar of I-beam, we can use a proportion. We know that the weight of the 10-ft bar is 208 lb, so we can set up the proportion as:

x / 6 = 208 / 10

By cross-multiplying, we get 10x = 1248. Dividing both sides by 10, we find that the weight of a 6-ft length is x = 124.8 lb.


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