If 28a+30b+31c=395.
then a+b+c=?.a,b,c are natural numbers  Choose the correct choice from the following answers.
A) 5  B) 8  C) 12  D) 13  E) 42
have a look on your calender   since,we all know a year consist of 365 days   february is d only month which has 28 days   4 months in a year has 30 days   and,rest 7 months has 31 days..   so,following d given eq. we can write 28*1 + 30*5+ 31*7..   hence values of a,b and c are 1, 5 and 7 respectively..   a+b+c=13   ANSWER:13
<result>D</result>
If 28a+30b+31c=395.
then a+b+c=?.a,b,c are natural numbers