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UKMT Junior Kangaroo, 2018

Algebra Difficulty 1.0 Junior Find the answer United Kingdom

William has four cards with different integers written on them. Three of these integers are $2$ , $3$ and $4$ . He puts one card in each cell of the $2\times 2$ grid shown. The sum of the two integers in the second row is $6$ . The sum of the two integers in the second column is $10$ . Which number is on the card he places in the top left cell?

(A) $2$ (B) $3$ (C) $4$ (D) $6$ (E) Can't be sure

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