7x+22 is greater than or equal to 15

I'll give brainliest if you answer right : )

Pls! does anybody know a shortcut for answering these types of questions in the future?

Arestaurant gives out a scratch-off card to every customer. the probability that a customer will win a prize from a scratch-off card is 25%. design and conduct a simulation using random numbers to find the experimental probability that a customer will need more than 3 cards in order to win a prize. justify the model for your simulation, and conduct at least 10 trials.