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UKMT Junior Mathematical Challenge, 2020

Algebra Difficulty 1.0 Junior Find the answer United Kingdom

In the table shown, the sum of each row is shown to the right of the row and the sum of each column is shown below the column. What is the value of $L$ ?

(A) $1$ (B) $2$ (C) $3$ (D) $5$ (E) $7$

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