Set 11: Linear Equations

Choice D is correct. Choice Ahoice C is the correct answer. 1. Define: $B = x$, $A = x + 20$. 2. Equation: $4x + 4(x + 20) = 400$ 3. Simplify: $4x + 4 x + 80 = 400 \rightarrow 8 x + 80 = 400$ 4. Subtract 80: $8x = 320 \rightarrow x = 40$ 5. Car A: $40+ 20 = 60$ Choice Ahoice B is incorrect because this is Car B. Choice Ahoice D is incorrect because it results from an error in the solution process. Choice Ahoice C is incorrect because it results from an error in the solution process.