Susan has $25. She is going to spend $4 on a book, then $3 per day on lunch.

a)Write an equation that represents the following question: "How many days can Susan buy lunch using this plan?"
b) Solve your equation, and check your solution.

a) d=(25-4)/3

b) do the rest itll be easy

7days

what is the format to solve this problem

a) To represent the question "How many days can Susan buy lunch using this plan?", we need to find the number of days Susan can buy lunch with the remaining money after purchasing the book.

Let d represent the number of days Susan can buy lunch.
The cost of lunch per day is $3.
The cost of the book is $4.
Hence, the equation that represents the question is:
$25 - $4 - ($3 * d) = $0

b) To solve the equation, we simplify it:

$25 - $4 - ($3 * d) = $0
$21 - ($3 * d) = $0
-$3 * d = -$21 (subtracted $21 from both sides)
d = -$21 / -$3 (divided both sides by -$3)
d = 7

The solution is d = 7, which means Susan can buy lunch for 7 days using this plan.

To check the solution, substitute d = 7 into the equation:

$25 - $4 - ($3 * 7) = $0
$21 - $21 = $0
$0 = $0

Since both sides of the equation are equal, the solution is correct. Susan can buy lunch for 7 days using this plan.