Name: Brunia Who is asking: Student Level of the question: Middle Question: A jar contains 36.25\$ in pieces of 0.10 and of 0.25\$. If it there has 250 change pieces in all, how much there he has pieces of 0.25\$ in the jar. Hi Brunia, I can see two ways to approach this problem. The first is using algebra. Let x be the number of 0.10\$ pieces then, since there are 250 coins in total, there are 250 - x coins with a value of 0.25\$. The total value of the x, 0.10\$ pieces is x 0.10\$. The total value of the x, 0.25\$ pieces is (250 - x) 0.25\$. But in total the value is 36.75\$ and hence x 0.10\$ + (250 - x) 0.25\$ = 36.75\$ Solve for x. The Second technique doesn't use algebra. Suppose that all 250 coins are 0.25\$ coins then the value is 250 0.25\$ = 62.50\$. But the sum is to be 36.25\$ so 62.50\$ is 62.50\$ - 36.25\$ = 26.25\$ too much. If you replace one 0.25\$ coin by a 0.10\$ coin you reduce the total by 0.15\$. How many reductions of 0.15\$ are needed to reduce the sum from 62.50\$ to 36.25\$? Whichever technique you use you should check your answer. Penny