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
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
1 answer
1 answer