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The sum of all two digit numbers divisible by 5 is:


Options:
A .  1035
B .  1245
C .  1230
D .  945
E .  None of these
Answer: Option D

Required numbers are 10, 15, 20, 25, ..., 95

This is an A.P. in which a = 10, d = 5 and l = 95.

tn = 95    The Sum Of All Two Digit Numbers Divisible By 5 Is:    a + (n - 1)d = 95

The Sum Of All Two Digit Numbers Divisible By 5 Is: 10 + (n - 1) x 5 = 95

The Sum Of All Two Digit Numbers Divisible By 5 Is: (n - 1) x 5 = 85

The Sum Of All Two Digit Numbers Divisible By 5 Is: (n - 1) = 17

The Sum Of All Two Digit Numbers Divisible By 5 Is: n = 18

The Sum Of All Two Digit Numbers Divisible By 5 Is: Requuired Sum = n (a + l) = 18 x (10 + 95)   = (9 x 105)   = 945. 2 2


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