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Answer

If Mrs Li baked 3u of chocolate cookies, she baked 1u of vanilla cookies. Total cookies 4u.

So 4u/2 = 2u cookies were sold. 

2u/6 = u/3  cookies sold were vanilla cookies.

u/3 = 18

u = 54

5*2u/6 = 90 chocolate cookies were sold.

3u = 162 chocolate cookies were baked

162 – 90 = 72 chocolate cookies were not sold.

Check: 4u = 216

2u = 108

108 -90 = 18

108/6 = 18 checked

 

 

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