CALCULUS

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The masses of 10 books are found to be in an arithmetic sequence. If their total mass is 13 kg and the lightest book has a mass of 400 grams, what is the mass of the heaviest book?

2,000 grams
2,100 grams
2,200 grams
2,300 grams
2,700 grams

  • CALCULUS -

    Sn = n/2 (a+a+(n-1)d)
    If Tn is the nth term,
    S10 = 5(a+T10)

    13000 = 5(400+T10)
    T10 = 2200

    The heaviest book is 2200g

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