Question 927397
you want to convert everything to cents so you are working with the same units throughout the problem.
$14.00 is equal to 1400 cents.
if you let x represent the number of coins of each type, then your equation becomes:
5x + 10x + 20x = 1400
combine like terms to get:
35x = 1400
divide both sides of this equation by 35 to get:
x = 40
you have 40 coins of each type.
40*5 = 200
40*10 = 400
40*20 = 800
add them up and  you get 1400 cents which is equivalent to $14.00