SOLUTION: Tweve iron poles are to be used for pillars and the length of the poles for an arithmetic progression (AP). If the third pole is 4m and the seventh pole is 10m. Find the length of

Algebra ->  Sequences-and-series -> SOLUTION: Tweve iron poles are to be used for pillars and the length of the poles for an arithmetic progression (AP). If the third pole is 4m and the seventh pole is 10m. Find the length of       Log On


   

Question 1030376: Tweve iron poles are to be used for pillars and the length of the poles for an arithmetic progression (AP). If the third pole is 4m and the seventh pole is 10m. Find the length of the poles inorder of AP and cost of all the poles if a meter cost $45.
Answer by ikleyn(52790) About Me  (Show Source):
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highlight%28Twelve%29 iron poles are to be used for pillars and the length of the poles for an arithmetic progression (AP).
If the third pole is 4m and the seventh pole is 10m. Find the length of the poles in order of AP and
cost of all the poles if a meter cost $45.
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Answer. The AP is  1, 2.5, 4, 5.5, 7, 8.5, 10, 11.5, 13, 14.5, 16, 17.5.

        Its sum is 111, and the cost is $45*111 = $4995.