To find the number of heart stickers in a pack of 140 stickers, we can use proportions. We can set up the proportion by using the number of stickers on the sheet of 28 stickers as the denominator and the number of heart stickers on the sheet of 28 stickers as the numerator. The proportion will look like this:
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(heart stickers in a pack of 140 stickers) / 140 = 16 / 28
To solve for the number of heart stickers in a pack of 140 stickers, we can first multiply both sides of the equation by 140 to get rid of the denominator on the left side:
(heart stickers in a pack of 140 stickers) = 140 * 16 / 28
Then, we can simplify the expression on the right side by dividing the numerator and denominator by 4 to get:
(heart stickers in a pack of 140 stickers) = 35
Therefore, a pack of 140 stickers would have 35 heart stickers.