Question

8. Find the sum of two digit numbers which are multiples of 5​

Answer 1

Answer:

5+5=10

Step-by-step explanation:

10 is multiple of 5 two times

Answer 2

Step-by-step explanation:

apply arithmetic progression concept

so here we go

first 2 digit number divisible by 5 is 10 and last is 95

moreover common difference would be constant throughout ie d=5

so for the above ap,,

tn=95 a=10 d=5

applying

tn=a+(n-1)d formula

thus substituting tn a and d values we get

n=18

so now using Sn=n/2 (t1+tn) formula

where t1=a=first term substitute values

I guess answer turns out to be 900

Yes 900 is answer