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Can someone check over these math problems that I did? Please?

1. The bloodhound, a type of dog, has 4.0 X 10^9 (10 to the ninth power) scent receptors in its nose. A human has 1.2 X 10^7 scent receptors. How many times more scent receptors does a bloodhound have than a human. round to nearest whole number. ---------- I got 333 is that right?
Last year, 65 pounds of hamburger patties were cooked to serve between 250 and 300 people. this year the school expects between 325 and 375 people. Estimate the number of patties needed for this year? ----- I'm really not sure on this one but I got 81 lbs but it does seem right!???

3. To make maple syrup, Kyle must boil 40 gallons of maple tree sap to produce one gallon of syrup. Ken sells his maple syrup in containers that hold one quart. At that rate, how many gallons of maple tree sap must be boiled to make one quart of syrup?----I got 160 gallons

4. Kyle collects sap in a cylindrical bucket having a diameter of 10 inches. If the bucket is filled with maple sap to a depth of 5 inches, how many gallons of sap does it contain? Give your answer to the nearest tenth of a gallon. USE ! GALLON = 231 CUBIC INCHES AND USE 3.14 FOR PIE------I got 1.7

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