Out of 275 coins, 120 are quarters. of the remaining coins, 20% are nickels and the rest are dimes and pennies. there are 3 pennies for every dime. how many pennies are there?
a. 31
b. 62
c. 93
d. 124

Total number of coins in question = 275
Number of quarters among the total coins = 120
Then
Remaining number of coins = 275 - 120
                                              = 155
Percentage of coins that are nickel = 20%
Then
Number of coins that are nickel = (20/100) * 155
                                                   = 155/5
                                                   = 31
Remaining number of coins = 155 - 31
                                              = 124
Ratio of dimes to pennies = 1:3
Let us assume the common ratio to be = x
Then
x + 3x = 124
4x = 124
x = 124/4
   = 31
So
The number of pennies = 3 * 31
                                       = 93
From the above deduction we can conclude that there are 93 pennies. The correct option among all the options given in the question is option "C".