Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake

Learn + solve

Shortcut used, common trap, and the fastest solving route

Shortcut used: Convert statements into present-age equations and keep age difference constant.

Solve in 3 steps:

1. Define present ages.
2. Translate past/future clues.
3. Use constant age difference.

Common mistake: Do not change the age difference over time.

Read the passage and answer: A town installed solar streetlights. The lights charged during the day and illuminated roads at night. What was the main benefit?

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