Question

You get hangry so you go to In-n-Out. You buy burgers for $3.45 and one milkshake for $2.30. Your bill is $16.10 before tax. Write and solve an equation to find the number of burgers you eat.

Define your variable: n = number of burgers you eat

Answer 1

ANSWER: ⇒ x = 4

Formulate:

2.3 + 3.45 × x = 16.1

Solve the equation:

2.3 + 3.45x = 16.1

Rearrange variables to the left side of the equation:

3.45x = 16.1 - 2.3

Calculate the sum or difference:

3.45x = 13.8

Divide both sides of the equation by the coefficient of variable:

x = ¹³·⁸/₃.₄₅

Multiply both the numerator and denominator with the same integer

x = ¹³⁸⁰/₃₄₅

Cross out the common factor:

x = 4