Amoney collection has $3.00 worth of coins: nickels, dimes, and quarters. the ratio of nickels to dimes to quarters is 3: 2: 1 how many quarters are in the collection?

They provide all the needed data...

n + d + q = $3.00                           (they provide a ratio) 
3:2:1 = $3.00                                 (let's enter the value of each)
3(.05) + 2(.10) + 1(.25)   
.15 + .20 + .25
.60 = is the value of the ratio   
let's divide the $3.00 by the .60 to get 5
let's now multiply the value of 5 to the ratio and solve the question...

3(5): 2(5): 1(5)
15 nickels
10 dimes
5 quarters

Answer for 2: his profit would be $2.88 explanation: you have to first multiply 72 and 0.12 together to get $8.64 once you do that you know how much money the shopkeeper made from selling the candy bars individually. so you have to do 8.64-5.76=2.88 hope that ; )answer for 3: yeah i’m sorry i have no idea what number 3 is. i’m sorry i couldn’t with that.