Question detail
method check: a bag has 3 blue counters and 7 red counters. Find the probability of choosing a blue counter.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Solving equations and inequalities
Question
- A. 0.3
- B. 3.3
- C. -2.7
- D. 0.6
Answer
The correct answer is 0.3.
Explanation
The distractors change the result or the form of the answer. The canonical solution reaches 0.3, so 0.3 is the only option consistent with the working.
Common mistake
Algebraic modelling common mistake 1
Writing a final answer without showing the method that justifies it. This can weaken answers for: [Higher only] Derive and solve two simultaneous equations from a contextual problem..
Show the method first, then give the final answer in the required form. Apply this directly to Algebraic modelling.
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