Question

Dave found 16 coins on the sidewalk. They were made up of quarters and nickels. If Dave found $1.80, how many nickels were there?

Answer 1

We know that a quarter is worth 0.25 dollars, while a nickel is worth .05 dollar.

Answer 2

So how many quarters make up about 1.80 without going over?

Answer 3

let x = quarters
let y = nickels

x + y = 16

0.25x + 0.05y = 1.80

Answer 4

solve the system of equations.

Answer 5

Or you can use an equation.

Answer 6

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