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Home > CAAC > Chapter 7 > Lesson 7.3.4 > Problem 7-113

7-113.

Write an equation for the problem.

x − 3 = y
3x + 2.5y = 218

x = the number of brownies
y = the number of cookies.

Substitute for y in the second equation and solve for x, the number of brownies.

3x + 2.5(x − 3) = 218
3x + 2.5x − 7.5 = 218
5.5x = 225.5
x = 41