Proportion problems just involve knowing that something stays the same. In this case we know how much 45 pieces weigh. We assume that each piece weighs the same and ask how many pieces are in 10 oz.
6/45 = 10/x
Now, to solve for x, multiply both sides by x:
6x/45 = 10
Multiply both sides by 45/6:
x = 450/6 = 75 pieces...
Thus 75 pieces weigh 10 oz.
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