Question

Find the sum of all 2 digital natural number that are divisible by 5

Answer 1

Given :  2 digital natural number divisible by 5​

To Find : the sum

Solution:

2 digits natural numbers

10 , 11 , 12 ___________________98 , 99

Divisible by 5

10 , 15 , 20 __________________90 , 95

95 = 10 + (n - 1) 5

=> n = 18

Sum =  (18/2)(10 + 95)

= 9 * 105

= 945

sum  of 2 digital natural number which are divisible by 5​  is 945

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