On a game show, a contestant randomly chooses a chip from a bag that contains numbers and strikes. The theoretical probability of choosing a strike is 3/10. The bag contains 9 strikes. How many chips are in the bag?

If the probability of choosing a strike is 3/10, that means that from the total items available 3 out of 10 are strikes, now, if there are 9 strikes total, this is the equation representing such result:

(3/10) (totalChips) = 9

if we solve for totalChips we have:

3 (totalChips) = 9*10 = 90

totalChips = 90/3 = 30

therefore the total amount of chips in the bag is 30