Question

Jessica would like to make a small notebook from A4 paper. She cut it into 4 and then sew the pieces together. If she has 40 sheets of A4 paper, how thick is the notebook?
Answer is 320 Pls answer with working out & method
4 small sheets for each piece of paper
4*40 = 160 sheets
2 pages per sheet, right?
So is 160 the answer because i might be wrong

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