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A total of $60,000 was invested for one year. Part of this [#permalink]
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Full Playlist (DS "Hards" — OG 2024): https://www.youtube.com/playlist?list=P ... xuFStg_I4s

Key Habit for Speed on Data Sufficiency:

We often don't need to actually solve.

We just need to know that we CAN answer the question.

This can save a lot of time on problems with harder calculations.

With 3 UNIQUE LINEAR equations and 3 variables (or 1 equation & 1 variable, 2 equations and 2 variables etc.), we can solve.

Caveats:
⚠️Watch out when it's asking for a "Combo" of two variables. For example, if the question asks for the ratio "X/Y", we can solve with the one equation 2x = 3y. We get "two birds with one stone."
⚠️The equations must be UNIQUE. A common trap is where one equation is just a multiple of the other. For example, x + 2y = 3 and 3x + 6y = 9 are really just the same equation!
⚠️Quadratics often have 2 different solutions for 1 equation. For example, x^2 = 9 has 2 different solutions: x=3 OR x=-3.
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A total of $60,000 was invested for one year. Part of this [#permalink]
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