凯莉一共买了 40 张正方形和长方形的手工纸。她把所有的正方形都剪成了 3 个长方形。现在她一共有 92 个长方形。她买了多少张长方形的手工纸？答：___

它不会直接告诉你答案，而是问你卡在哪一步看看 AI 是怎么陪你一步步弄懂这道题的

完整解法

1. Assume all pieces were rectangles and find the total number of rectangles in this scenario

If all $40$ pieces were rectangles, the total number of rectangles would be $40 \times 1 = 40$ .

2. Find the difference between the actual number of rectangles and the assumed number

Difference in total rectangles $= 92 - 40 = 52$ .

3. Find the difference in rectangles produced by one square compared to one rectangle

Each square produces $3$ rectangles, which is $3 - 1 = 2$ more rectangles than a piece of rectangular paper.

4. Calculate the number of squares and then the number of rectangles

Number of squares $= 52 \div 2 = 26$ .
Number of rectangles $= 40 - 26 = 14$ .

答案

$14$

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