Just a quick comment on the nature of this problem: it’s really badly worded. The answers you have above assume that the 5.25% is a percent by weight, and I have no doubt that’s what the problem meant, but percentage can be calculated in other ways. For instance, suppose you have three pieces of lead, each weighing 10 pounds, and three pieces of styrofoam, each weighing 1/3 of a pound. Of your six pieces, 50% of them (by number) are lead. By weight, though, 30 out of 31 pounds of it, which is 96.8%, is lead. Whenever someone tells you that, for instance, the human body is 90% water, you always want to wonder if they’re talking by weight, by volume, by number, or by something else.

10.5 pounds of copper in a 200 pound piece of alloy.

5.25% of 200 is 10.5 pounds.

do no longer be so helpful all those different solutions are perfect. you’re able to ascertain what the contraptions of the proportion are until you may now ascertain the mass of copper in 2 hundred pounds. If the proportion is by utilising volume you will could be responsive to the density of copper to transform the quantity to % mass. in any different case if the proportion is by utilising mass, only multiply the % by utilising the finished mass to get the respond. If no indication is given of what the proportion is, tell your instructor that no longer adequate preparation grow to be given and that he/she assigned a bad project.

Multiply the total weight by the percentage:

200 pounds

X 5.25%

————–

10.50 pounds

10.5 pounds…just take 5.25% of 200 pounds….good luck

10.5 pounds Duuuuuhhhhhh!