Mr. T's piggy bank has all nickels and dimes. The total value of the money in the piggy bank is $7.80. If Mr. T's piggy bank has 66 nickels, write and solve a linear equation to find the number of dimes in the piggy bank.

80π/3 or about 83.775

step-by-step explanation:

since a cone is 1/3 of a cylinder, we need to find the base's area. since area = πr^2, we get 16π. then, multiplying this by 5, we get 80π. dividing by 3, since the cone's volume is 1/3 of that of a cylinder's, we get 80π/3.

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