Susan has a piggy bank into which she puts only nickels. The amount of money in dollars D in the bank is given by D = n/20, where n is the number of nickels in the piggy bank.

Question

if Susan has 80 nickels in her piggy bank how many dollars does she have.

if Susan has 94 Nichols in her piggy bank, how many dollars does she have.

Based on your answers to parts A & B explain why the equation makes sense.

Answer 1

D=80/20 = 4 dollars

D=94/20 = 9.4/2 = 4.7 = $4.70

The number of dollars is the number of nickles times 0.05. Each nickel is worth 5 cents or .05 dollars.

.05 = 5/100 = 1/20. 1/20 times n = n/20 = D