Question

http://awesomescreenshot.com/0fb3h1cd25

I initially solved this incorrectly but I multiplied 3 by 24 and got 72...is that the correct way to go about this?

Answer 1

\[3p+24=240\] solve for \(p\)

Answer 2

P = 72

Answer 3

3 x P + 24 = 240 where P = 72

Answer 4

The first step is get clear that the formula
c( p) = 3p+24
is a formula where you "put in" number of people, and "get out" number of cookies. in other words, c( p) is the # of cookies.
they tell you 240 cookies. That means replace c( p) with 240 and write
240= 3p+24
or
3p+24= 240

now it is a "standard equation"
there is a recipe... (do lots of these problems until it's automatic):
add -24 to both sides
3p + 24 - 24 = 240-24
simplify
3p = 216

next, divide both sides by 3
(3/3)p = 216/3
p = 72

Answer 5

yeah phi is right

Answer 6

Thank you @AQ99 and @phi I understand now (: