Question

During an election campaign, a candidate gave away 5000 little advertisements. the pens he gave away cost $0.23 each and the bumper stickers cost $0.14 each. he spent a total of $970.00 for the pens and bumper stickers. how many pens did he give away?

Answer 1

x - number of pens
y - number of stickers

{x + y = 5,000
{0.23x + 0.14y = 970

{x = 5,000 - y
{0.23(5,000 - y) + 0.14y = 970

{x = 5,000 - y
{1,150 - 0.23y + 0.14y = 970

{x = 5,000 - y
{-0.09y = -180

{x = 5,000 - y
{y = 2,000

{y = 2,000
{x = 3,000

He gave away 3,000 pens.