Hello there!
9 nickels = 45g
1 nickel = ?
Then cross multiply that
45 * 1 = 9 * x
45 = 9x
x = 45/9
x = 5
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To do this you will take the mass of the sack which is 45g.
Divide this amount by the number of nickels in the sack which is 9.
So the mass of one nickel is 5g.
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