English, 22.07.2019 17:30 montana53

There are two piles, one containing 9gold coins and the other 11silver coins. the two piles of coins weigh the same. one coin is taken from each pile and put into the other. it is now found that the pile of mainly gold coins weighs 13units less than the pile of mainly silver coins. let x represent the weight of each gold coin and y the weight of each silver coin. find the weight of a silver coin and of a gold coin.

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Answer from: twhalon72

Weight of silver coin = 29.25 units , weight of gold coin = 35.75 units

Explanation:

Let the weight of 1 gold coin be $W_{1}$

Weight of 1 silver coin be $W_{2}$

Total no of gold coins = 9

Total no of silver coins = 11

Total weight of gold coins = 9 $\times W_{1}$

Total weight of silver coins = 11 $\times W_{2}$

It is given that both weigh same thus we have

$9W_{1}=11W_{2}............(i)$

After replacing coins the weights become as under

$Gold Stack\\9W_{1}-W_{1}+W_{2}=8W_{1}+W_{2}\\\\SilverStack\\\\11W_{2}-W_{2}+W_{1}=10W_{2}+W_{1}$

Now it is given that gold stack weighs 13 unit less thus adding 13 units to gold stack gives it's weight equal to silver stack

the above relation modifies as

$8W_{1}+W_{2}+13=10W_{2}+W_{1}\\7W_{1}+13=9W_{2}..........(ii)$

$8W_{1}+W_{2}+13=10W_{2}+W_{1}\\7W_{1}+13=9W_{2}..........(ii)\\\\7\frac{11W_{2}}\\\\Solving equation i and ii we get\\\\{9}+13=9W_{2}\\\\77W_{2}+117=81W_{2}\\\\4W_{2}=117\\\\W_{2}=\frac{117}{4}=29.25units\\\\W_{1}=\frac{11W_{2}}{9}=35.75units$

Answer from: Quest

Ican’t answer if you don’t give me the excerpt

Answer from: Quest

1. read the following excerpt from franklin d. roosevelt's "fireside chat 19":

on the other side of the picture, we must learn also to know that guerilla warfare against the germans in, let us say serbia or norway, us; that a successful russian offensive against the germans us; and that british successes on land or sea in any part of the world strengthen our hands.

remember always that germany and italy, regardless of any formal declaration of war, consider themselves at war with the united states at this moment just as much as they consider themselves at war with britain or russia. and germany puts all the other republics of the americas into the same category of enemies. the people of our sister republics of this hemisphere can be honored by that fact.

the true goal we seek is far above and beyond the ugly field of battle. when we resort to force, as now we must, we are determined that this force shall be directed toward ultimate good as well as against immediate evil. we americans are not destroyers — we are builders.

analyze the effectiveness of this excerpt. how does it function within the speech as a whole? how does the structure of the excerpt to convey the speech's purpose and key points? support your argument with evidence from the speech. (10 points)

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There are two piles, one containing 9gold coins and the other 11silver coins. the two piles of coins...