7.5 pounds
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(10 ÷ 4) × 3 = 7.5 lb
The value of ten pounds of quarters is $90.00. This is calculated by knowing that there are 40 quarters in a pound, so ten pounds would contain 400 quarters. Since each quarter is worth $0.25, multiplying 400 quarters by $0.25 gives you $100.00.
It is 10.75
10.75
Just divide thirty by ten to get three, and there you have it; three pounds is ten percent of thirty. This is proven by multiplying three by ten to get thirty.