Question 39961
<pre>Let's say he gave away x pens and y stickers.

He gave away 5000 little advertisements.

Therefore, x + y = 5000

The pens each cost 23 cents and the stickers cost 14 cents and he spent 970 dollars,

Therefore, 0.23x + 0.14y = 970

We now have simultaneous equations.

 x + y = 5000 (1)
0.23x + 0.14y = 970 (2)

Manipulate (1)

x +y = 5000

y = 5000 - x (3)

Substitute (3) into (2)

0.23x + 0.14y = 970

0.23x + 0.14(5000-x) = 970

0.23x + 700 - 0.14x = 970

0.09x = 270

x = 270/0.09 = 3000

He gave away 3000 pens.
Altogether, he gave away 5000 advertisements. Therefore, he gave away 2000 stickers as well.

Hope that helps!
</pre>