知识点 6

Perform simple quantitative reasoning using provided data (differences, ratios, rates).

Use the data to do one short calculation, such as a difference, ratio, or rate.

核心知识

Use the data, then do the short math cleanly. ACT Science usually wants one simple calculation built from values you can read directly.

深入理解

These questions combine extraction with a small calculation. The math is usually a difference, ratio, average rate, or percent-style comparison, not a long algebra problem.

  • Read the needed values first.
  • Choose the right operation: difference, ratio, or change per unit.
  • Keep the units attached so you know whether the result should be colonies, mL per minute, or grams per liter.

Most misses are operation mistakes, not science mistakes.

分步讲解

  1. Write down the exact values named in the question.
  2. Decide whether the question asks for a difference, ratio, or rate.
  3. Perform the calculation with units included.
  4. Check whether the answer choice has the right magnitude and unit.

常见误解

  • Adding values when the question asks for change or difference.
  • Forgetting to divide by time when the question asks for a rate.
  • Reporting a raw number without the derived unit.
题目

示例解析

Table 3 shows cell count in one culture: 12 cells at 0 min and 36 cells at 8 min. Based on Table 3, what was the average increase in cell count per minute over that interval?

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