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Question

Tanveer constructs a wall working in a special way and takes 12 days to complete it. If Sn is the length of the wall (in m) that he constructs on the nth day, then
Sn=2n,0n4Sn=8, for n=5Sn=3n7,6n12
Find the total length of the wall he constructs in the first 10 days.

A
31 m
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B
35 m
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C
113 m
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D
None of these
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Solution

The correct option is C 113 m
Let us make a table of the units of work everyday:
Day12345678910Length246881114172023
Total length = 113 m

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