Dany bought a total of 20 game cards some of which cost $0.25 each and some of which cost $0.15 each. if dany spent $4.20to buy these cards, how many cards of each type did he buy?

For this case we have to:

x: Represents the $ 0.25 game cards

y: Represents the $ 0.15 game cards

We have then:

From the second equation we have:

Substituting in the first equation:

So, I buy 8 game cards for $ 0.15

On the other hand we have:

So, I buy 12 game cards for $0.25

Buy 8 game cards for $0.15

Buy 12 game cards for $0.25

b

step-by-step explanation:

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: