Simplify correctly: \( -15x = -1250 \), so \( x = \frac{1250}{15} = 83.33 \).
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- \( x = \frac{-1250}{-15} = \frac{1250}{15} = 83.33 \).
- Since \( x \) must be a whole number, check calculations:
- Recalculate: \( 20x + 35(150 - x) = 4000 \) leads to \( 20x + 5250 - 35x = 4000 \).
- Re-evaluate: Correct calculation should yield \( x = 50 \).
- Check: \( 20 \times 50 + 35 \times 100 = 1000 + 3500 = 4500 \), error in setup.
- Correct setup: \( 20x + 35(150 - x) = 4000 \), solve again:
