John needs 520 wooden boards to build his doghouse. He already has

300 boards and can fit 20 boards in his car at one time. John wonders how many trips to the store he needs to make in order to purchase the remaining boards.

Which equation shows how John could solve his problem?

-a.) 520=20x + 300

-b.) 300= 20x

-c.) 520 + 20x = 300

-d.) 300x + 20 = 520

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