a student earned a grade of 80% on a math test that had 20 problems how many problems on this test did the student answer correctly

ANSWER  16 out of 20 correct

Step-by-step explanation:80% of 20=0.8*20=16

or,...

80%=80/100=(80/5)/(100/5)=16/20; 16 out of 20 correct

step-by-step explanation:

answers available in this download

(pearson%2c%25202012)%2520bbs.pdf& usg=aovvaw1obmtxnfghfgxhx0urh_je

amount of oatypop that contains the prize = 40%

amount   of oatypop which doesn't contain the prize = (100-40)=60%

probability that hannah will win a prize

    = s +f s +f f s+ff   f s+ff f f s+ infinity.where f= failure,s= success

=   or 60%

probability that hannah only has to buy 3 or less boxes before getting a prize= (s) and ( f s) and (ff s) and (f f f s)

        = = 87.04 %  

step-by-step explanation: