A long thin strip of width 10cms is kept on a flat surface .another identical strip is kept on it as a over loading manner such that the combined width of two is 15cms .what is the width if 22 strips kept like this ?

a.115 cms
b. 110 cms
c. 200 cms
d. 95 cms

• you can also solve it through A.P. 1st term=10 ,c.diff.=5, no. of term(n)=22
  T22=10+(22-1)*5=10+105=115
• 10 years agoHelpfull: Yes(31) No(2)
• 10cms width nxt strip added half of the width of original increases so 22 strips
  n+n/2+n/2+............21 times
  10+5+5........
  10+(5*21)
  115 ans
  
• 10 years agoHelpfull: Yes(6) No(0)
• 115
  21*5+1*10=115
• 10 years agoHelpfull: Yes(1) No(0)
• 7.5+5+5+.....20 terms....+5+7.5=115
  which is the right answer
  
• 10 years agoHelpfull: Yes(0) No(0)
• 222*5 + 5( 5 extra for the topmost strip )
• 10 years agoHelpfull: Yes(0) No(1)