Shelley’s pet food store sold one customer 5 peanut butter biscuits for $3. She sold another customer 7 beef treats for $4.20. Write a proportion that compares the sales of these two items, and find the cross products. The cross products are both equal to
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Given : sold one customer 5 peanut butter biscuits for $3
sold another customer 7 beef treats for $4.20
To Find : a proportion that compares the sales of these two items,
The cross products
Solution:
sold one customer 5 peanut butter biscuits for $3
Price for one biscuit = 3/5
sold another customer 7 beef treats for $4.20
Price for one biscuit = 4.2/7
3/5 = 4.2/7
=> 3 x 7 = 4.2 x 5
=> 21 = 21
cross products = 21
Equal cross products mean price per biscuits are same
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