If a number is divisible by 3 and 5 then it is divisible by 15

Yes it is

Step-by-step explanation:

Since the multiplication of 3 and 5 will give 15

I.e 3 × 5 = 15

Then any number that can be divided by 3 and 5, can also be divided by 15.

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: