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Math Practice Question 3 of 10
Problem
A store sells notebooks for $4 each and pens for $2 each. If a customer buys a total of 12 items and spends $36, how many notebooks did the customer buy?
Medium Algebra
Select the correct answer:
A 4 notebooks
B 6 notebooks
C 8 notebooks
D 10 notebooks

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Reading & Writing 05:32
Passage
The discovery of penicillin by Alexander Fleming in 1928 revolutionized medicine. Fleming noticed that a mold called Penicillium notatum had contaminated one of his petri dishes and was killing the bacteria around it...
Easy Inference
Based on the passage, what can be inferred about Fleming's discovery?
A It was accidental
B It was planned
C It took years
D It was disputed
AI Coach ● Online
Can you explain why B is correct for the algebra problem?
Great question! Let's solve it step by step:

Let n = notebooks, p = pens
• n + p = 12 (total items)
• 4n + 2p = 36 (total cost)

Substituting: 4n + 2(12-n) = 36
→ 4n + 24 - 2n = 36
→ 2n = 12
→ n = 6 notebooks ✓

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