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Jamal got a job working on a assembly line in a toy factory, on the 20th day of work, he assembled 137 toys, he noticed that since he started , every day he assembed 3 more toys then the day before , how many toys did jamal assemble all together during his first 20 days

  • math -

    easy ...

    d = 3 and
    term20 = 137
    a+19d = 137
    a + 57 = 137
    a = 80

    now take the sum of first 80 terms

  • math -

    2170 toys

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