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while baking cookies, william accidentally over baked and burned many of the cookies. His "burned ro unburned" rstio was 1 to 3. He made 45 unburned cookies. what percent of the total cookies were burned.

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sqdancefan

Given

burned : unburned = 1 : 3

Find

burned/total as a percentage

Solution

burned : total = burned : (burned + unburned) = 1 : (1+3) = 1 : 4

As a fraction, this is 1/4 = 0.25 = 25%

25% of the total cookies were burned.

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"%" is a fancy way to write "/100". You know from place value that 0.25 (twenty-five hundredths) is 25/100, so that can also be written as 25%.

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