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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?
Vinit800HBS
Seeing lots of convoluted answers and unnecessary calculations. Here goes a simple approach.

For the first part, it's the total revenue (850) received for 65 fast-piece items. Hence, per item cost to the customer is: 850/65 ~ 13

Now for the second part, let's think some basics first. If the price becomes double, all we have to do is sell only half as many items as before to earn the "same revenue". If the price triples, we have to sell only one-third as many items as before to earn the same revenue.

Now, with that thought in mind, we will also use basic equation for Revenue = Cost + Profit
Currently, we have 50% profit margin.
Hence, Revenue is 1.5CP
Now, we want 100% profit margin.
Hence, Revenue is 2CP

COMBINING THE ABOVE TWO IDEAS,

1.5CP = 65*Price per item
2CP = N * 5*Price per item

Just take the ratio and you will get N ~ 17

Hope that helps.

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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 Throughout
You 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" Constraint
The 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 Needed
Notice 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 much

If 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).
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