Julioo
Vinit800HBS Solid. What did you notice in the problem that made you realize ratios would allow for a much simpler solution? What signs should we look for to recognize when ratios are an efficient approach to simplifying a problem, as you did?
Julioo Here are some ways you'd know if ratios can be used to simplify the question:
Key Pattern Recognition Triggers:1. Proportional Relationships ThroughoutYou spotted that
everything scales proportionally:
- Markup: \(50\%\) → \(100\%\) (doubles)
- Price per piece: \(\$13\) → \(\$65\) (5x multiple)
- Revenue structure: \(1.5C\) → \(2C\) (maintains ratio form)
When you see
multiple proportional changes, think ratios immediately!
2. The "Unchanged Total" ConstraintThe phrase "total costs remain unchanged" is a
huge ratio signal. It means:
- \(\text{Cost}_{\text{fast}} \times 65 = \text{Cost}_{\text{classic}} \times N\)
- This naturally sets up a ratio equation
3. No Absolute Values NeededNotice you never needed to calculate:
- Actual cost per item
- Total company costs
- Absolute profit amounts
When the answer depends on
relationships rather than specific values, ratios will simplify dramatically.
Strategic Recognition Framework:In first 5 seconds, scan for:1. Multiple percentage/fraction changes (\(50\%\) → \(100\%\), 5x price)
2. Constraint phrases ("remain the same," "unchanged total," "constant ratio")
3. Questions asking for
how many rather than
how muchIf you spot 2+ of these →
Set up ratios before calculating!Common GMAT Variations:You'll see this same pattern in:
- Mixture problems (concentration ratios)
- Work rate problems (efficiency changes)
- Scale/proportion word problems
You can practice similar questions
here under TPA (you'll find a lot of OG questions).