In a jar of coins, the ratio of nickels to dimes is 5: 7. if the jar contains 350 dimes, how many nickels are there?
a) 200
b) 225
eliminate
c) 250
d) 500

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236