Final answer:
To find the number of crayons in the box before the students took any out, you can set up an equation and solve for x. The number of crayons in the box before the students took any out is 96.
Step-by-step explanation:
To find the number of crayons in the box before the students took any out, we can set up an equation. Let x represent the number of crayons in the box initially.
After 7 students each took 13 crayons, there were 5 crayons left in the box. So we can write the equation:
x - (7 * 13) = 5
Simplifying the equation, we have:
x - 91 = 5
Adding 91 to both sides, we get:
x = 96
Therefore, the number of crayons in the box before the students took any out is 96.