The sum of all positive integers less than 400 which are divisible by 5. can someone give me the steps to do this?

Sum of all positive integers less than 400 and divisible by 5 is 15,800.

Step-by-step explanation:

TO FIND :

The sum of all positive integers less than 400 which are divisible by 5.

The set of positive integers  =  1,2,3, 4,5,6,7,.........,,

Now, the number should be divisible by 5.

SO, the desired set of positive integers =  { 5,10,15,20,.......}

Again the numbers are LESS than 400.

So, the desired set of positive integers =  { 5,10,15,20,....... 385,390, 395}

Here, First term a  = 5, common difference d  = 4 and last term an = 395

⇒There are total 79 terms in the series.

So, SUM OF 79 TERMS  =

Hence, The sum of all positive integers less than 400 which are divisible by 5 is 15,800.

answer: the area of the parallelogram below is 42 square meters.

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