You would divide 100/20 and get 5. then u would multiply 9 times 5 equals 45 then add a decimal to get ur answer 0.45
Hence, option A 0.64 is the correct answer.
Further explanation:
Ounce is a larger unit than grams. When we have to go from a smaller unit to a larger unit we use division.
So,
Given
28.3 grams = 1 ounce
Then

Hence, option A 0.64 is the correct answer.
Keywords: Conversions, Units of measurement
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I found this online, hope it helps
Just follow these steps:
Multiply normally, ignoring the decimal points.
Then put the decimal point in the answer - it will have as many decimal places as the two original numbers combined.
I believe it would be 68 miles per hour! To find the unit rate here you would divide miles by hours, or 340 by 5, which would give you 68.