AlgebraMediumInput from a linear model's output
Algebra practice question
A plant was 15 centimetres tall when it was bought and has grown 0.75 centimetres per day since. After how many days will it be 30 centimetres tall?
Answer: 20
15 + 0.75d = 30 gives 0.75d = 15, so d = 20.
Common wrong answers
- If you answered 40
- 40 divides 30 by 0.75 without first subtracting the starting 15 cm.
- If you answered 60
- 60 adds the 15 instead of subtracting: (30 + 15)/0.75.
- If you answered 11.25
- 11.25 multiplies 15 by 0.75 instead of dividing.
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