Let day 1 = *x*.
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- Total spent: 3 + 3.50 = <<3+3.5=6.5>>6.50 dollars.
- Remaining: 12 - 6.5 = <<12-6.5=5.5>>5.5 dollars.
- A primatologist observed that a young chimpanzee used 12 tools in 3 days. On day 2, it used 20% more tools than day 1, and on day 3, it used 25% fewer than day 2. How many tools did it use on day 1?
- Day 2 = x + 0.2x = 1.2x.
- Day 3 = 1.2x – 0.25(1.2x) = 1.2x × 0.75 = 0.9x.
- Total: x + 1.2x + 0.9x = 3.1x = 12 → x = 12 / 3.1 ≈ <<12/3.1=3.871016129032258>>3.87 (rounded to two decimals).
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