A container of Aunt May’s cookie dough normally makes 30 cookies but due to my m

Question

A container of Aunt May’s cookie dough normally makes 30 cookies but due to my malfunctioning oven, I only obtain 18 unburned cookies from each container of cookie dough that I bake.

(i) What percentage of unburned cookies do I actually obtain? Please enter your answer to the correct number of significant figures.

(ii) How many containers of Aunt May’s cookie dough would I have to buy to obtain 2.0x102 unburned cookies using my malfunctioning oven? Please enter your answer to the correct number of significant figures.

Explanation / Answer

total number of cookies dough makes = 30

out of which 18 are unburned

i) percentage of unburned cookies = 18 / 30 * 100

= 60%

ii) 2.0* 10^2 = 200

1 container gives 18 unburned cookies

so lets say x container gives 200 unburned cookies

1 / x = 18 / 200

x = 200 / 18

x = 11.10

therefore , you have to buy approx 11 containers to get 2.0*10^2 unburned cookies

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