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If the sum of the numbers in a 2 × 2 grid from a calendar is 40 and the top left number is represented by 'a', what is the equation for the sum?

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Q-00134038

If the sum of the numbers in a 2 × 2 grid from a calendar is 40 and the top left number is represented by 'a', what is the equation for the sum?

4a + 16 = 40

a + 8 = 40

a + (a + 1) + (a + 7) + (a + 8) = 40

2a + 10 = 40

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