Aclerk was asked to change a $10 bill. she returned nine more dimes than nickels, and twenty one more quarters than dimes. how many coins of each did she return

Let x = number of nickels

x + 9 = dimes               (nine more dimes than nickels

x + 9 + 21 = quarters   (21 more qtrs than dimes

.05(x) + .1(x+9) + .25(x + 9 + 21)  = 10

.4x + 8.4 = 10

.4x = 1.6

x = 4     - nickels

x+ 9 = 13    - dimes

x + 30 = 34   - quarters

Hope this helps

chemists are often responsible for designing a chemical reaction and analyzing the products obtained from it. one significant part of designing a chemical reaction is determining the amount of each reactant that is needed and the amount of each product that will be produced. in order to do so, chemists use stoichiometry, the quantitative relationships between reactants and products.