US quarters weigh 5.67 gm which is 0.2 ounces, so 5 ounces would be 25 quarters, or $6.25
Canadian quarters made since 2000 weigh 4.40 gm, so 5 ounces (142 gm) works out to 142/4.4 = 32 quarters (rounded to the nearest whole number). 32 quarters are of course worth $8.
If the quarters are dated 1964 or earlier they are silver and worth a bit more than $5 each, if the quarters are 1965 or later, they are simply worth 25 cents in average condition.
There are 80 quarters in a pound, which is $20. 100 pounds of quarters is $2,000.
One pound of quarters (post 1965) should equal $20.00, (80 quarters)so 10 pounds is $200.00
0
60.00
460.00
163.50
$800
A modern quarter weighs 5.67 grams. 128 lbs is 58,059.82 grams, so that's about 10240 quarters, or $2560.
It depends if they are copper-nickel (post-1964) or 90% silver quarters (1964 and earlier). If they are copper-nickel, dated 1965 and earlier, they are only worth face, if they are silver, they are worth the silver content.
One modern U.S. quarter weighs 5.67 grams. At 80 quarters per pound, 19.4 pounds is 1,552 quarters, which is $388.
1000$
Using modern (1965-present) quarters at a weight of 5.67 grams, with 453.59 grams to a pound, that gives 80 quarters per pound. 59 pounds times 80 quarters is 4,720 quarters, divided by four makes $1,180.
337 pounds of quarters is equal to approximately $6740.
Forty pounds
If They Are Not Circulated It Would Take 3600 At A Value Of $900.00 A quarter weighs about 5.7 grams or 0.01257 lbs. So you would need about 3580 quarters (or $895 worth of quarters) to weigh 45 lbs.
About 25 pounds.