math HELP PLEASE

Ravi is putting up a fence in his backyard. He builds 3 units the first day, 7 units the second day and 11 units the third day. If he continues this pattern, how many days will it take him to finish the 55 unit fence?

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  1. Each day he puts up 4 more units than the day before.

    By the third day he's put up 21 units.
    4th day = 15 units = total 36 units
    5th day = 19 units = total = 55 units

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