This year Martin earned $1615 mowing lawns shoveling driveways and doing yardwork. this is 19 times as much as he earned last year. How much did Martin earn last year?

1 answer

Let X be the amount Martin earned last year.

Therefore, 19X = $1615

Dividing by 19 on both sides:

X = $1615 / 19
X = $85

Martin earned $85 last year.