12 pont's
ronny read for 2.75 hours yesterday. his older brother read for 1.18 hours and his younger brother read for 0.43 hours.

how long did the three brothers read yesterday altogether?

a. 1.14 hours
b. 3.12 hours
c. 4.12 hours
d.4.36 hours

$450 is the answer.

step-by-step explanation:

30% of 450 = 135

450-135=315

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: