Answer:

12+3=15

Step-by-step explanation:

a normal packet of of cereal has 12 oz

it means 100%(normal packet)=12oz

so,100%(normal)+25%(extra)=12+(25%of12)

25%extra free pack of cereal has 25/100 * 12 oz

25/100=1/4

=1/4*12

see the attachment for explanation

so total ounces in the packet = 15oz

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