9514 1404 393
Answer:
Step-by-step explanation:
If all of the coins were dimes, the 30 coins would have a value of 300 cents. Their actual value is 450 -300 = 150 cents more than that.
Replacing a dime with a quarter adds 25 -10 = 15 cents to the value. Since the value is 150 cents greater than for all dimes, there must be 150/15 = 10 quarters in the mix.
There are 10 quarters and 20 dimes in Cameron's pocket.
