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Q. The sum of all two digit numbers divisible by 5 is

  • (A) 945
  • (B) 678
  • (C) 439
  • (D) 568
  • Correct Answer - Option(A)
  • Views: 24
  • Filed under category Math
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Explanation by: Admin

Required numbers are 10,15,20,25,...,95
This is an A.P. in which a=10,d=5 and l=95.
Let the number of terms in it be n.Then t=95
So a+(n-1)d=95.
10+(n-1)*5=95,then n=18.
Required sum=n/2(a+l)=18/2(10+95)=945.

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