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The ratio of the cost of a donut to the cost of a pizza is 2:9. Keith spent 1/3 of his money on 4 pizzas and 12 donuts. He bought some more donuts with 5/6 of the remaining money. How many donuts did Keith buy altogether?

 Nov 4, 2021
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2/11   of   1/3   of his money represents 12 donuts

                 2/33 of money = 12 donuts

 

Spends 1/3   leaving 2/3  of his original money

     he spends 5/6 of this 2/3 on donuts    =  10/18 of his original money

               how many  2/33 rd's are there in  10/18 ?

                             10/18 / 2/33   * 12 = 110 additional donuts

                      110 + the original 12 donuts = 122 donuts all together.

 Nov 4, 2021

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