Problem preview
MF.PR.7 Challenge MF-021-A12-V01

Solve proportion equations and explain why the setup matches the context.

Identify all valid setups for one proportion problem

Problem

A map uses a scale of \(3~\text{centimeters}~\text{for}~\text{every}~24~\text{kilometers}\). \(\text{Two}~\text{cities}\) are \(8.5~\text{centimeters}\) apart on the map. Which complete response correctly evaluates the candidate equations for modeling the real distance \(d\)?

A. \(3/24~=~8.5/d\)
B. \(24/3~=~d/8.5\)
C. \(3/8.5~=~24/d\)
D. \(24/8.5~=~3/d\)
E. \(3/24~=~d/8.5\)
F. \(8.5/3~=~d/24\)

Big Picture

What this problem is really about

Start by locking in the two matched pairs: each map distance belongs with its real distance. A valid equation may compare map to real, real to map, original to new, or new to original, as long as that order stays consistent on both sides. After screening every candidate this way, solve one surviving proportion and check the distance against the map scale.

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Four variants of this problem type
Curriculum context
Standard
MF.PR.7
Category
Proportional Reasoning
Domain
Equations
Objective
Solve proportion equations and explain why the setup matches the context.
Problem type
Identify all valid setups for one proportion problem