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Weekly Problem 46 - 2008

Stage: 3 Short Challenge Level: Challenge Level:1
\begin{eqnarray} \text{Weight of 1 sheet of paper} &=& \text{Weight of letter with 2 sheets} - \text{Weight of letter with 1 sheet} \\ &=& 20 \; \text{g}- 15 \; \text{g} \\ &=& 5 \; \text{g} \end{eqnarray}

This problem is taken from the UKMT Mathematical Challenges.

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