Let's assume
number of quarters is q
number of nickels is n
Kevin and randy muise have a jar containing 60 coins
so,
![q+n=60](https://img.qammunity.org/2019/formulas/mathematics/middle-school/6h376nhppikjbiy4u9zwkyyjlrqa4hvlpx.png)
now, we can solve for n
![n=60-q](https://img.qammunity.org/2019/formulas/mathematics/middle-school/cyxwctlyazdeng3dx6abuvi7mxsw32nkp5.png)
we know that
1 quarter =0.25 dollar
1 nickel = 0.05 dollar
now, we can set equation for value
![0.05n+0.25q=10.20](https://img.qammunity.org/2019/formulas/mathematics/middle-school/lozeupphsv4z3zmw9ce29e4tqnuqanstcn.png)
now, we can replace n
![0.05(60-q)+0.25q=10.20](https://img.qammunity.org/2019/formulas/mathematics/middle-school/x9sutom6k0ze8va7kpmfdze6lt34sr7v5e.png)
now, we can solve for q
![3-0.05q+0.25q=10.20](https://img.qammunity.org/2019/formulas/mathematics/middle-school/9plgdd8m2pbb7ckx4foiprleildb2wmdst.png)
![3+0.20q=10.20](https://img.qammunity.org/2019/formulas/mathematics/middle-school/1pulv0ln74iwwzsralxsuabiqbrrsulw6c.png)
![q=36](https://img.qammunity.org/2019/formulas/mathematics/middle-school/ax707qjmubclezhhsk49dxma3vazfw1hbd.png)
now, we can solve for n
![n=60-36](https://img.qammunity.org/2019/formulas/mathematics/middle-school/iff4kxjiwqdyjjaavplm08j716syn8zu3g.png)
![n=24](https://img.qammunity.org/2019/formulas/mathematics/middle-school/7l1kyvwrols6y6h461erpz74qe5qn0rvdu.png)
so, number of quarters is 36
number of nickels is 24.................Answer