Question

brad wants to buy flowers for a friend with 15 dollars daises are 1 dollar each and roses are 3 dollars a piece he buys 3 more daises than roses how much did the roses cost

Answer 1

Money spent = money spent on rose + money spent on daisies
# of roses = # of daisies + 3

or
$15 = 3r + 1d
r = d + 3 or d = r - 3

$15 = 3r + (r - 3)
15=4r - 3
4r=12
r = $3