Question

find the sum of all integers between 84 and 719 which are multiples of 5

Answer 1

hey friend⭐
........
here is ur answer...
TO FIND :-the sum of multiples of 5 between 84 and 719
SOLUTION :-
multiples of 5 btw 84 and 719 forms A.P
abd in this AP WE HAVE:-
a = 85
d = 5
an or last term = 715
n = ?
sum of n terms = ?
so firt we habe to find no. of terms
so an = a+ (n-1) * d
→715 = 85 + (n-1) *5
→715 - 85 = (n-1) *5
→630/5 = n-1
→126+1 = n
no. of multiples of 5 btw 84 and 719= 127
so sum of multiples = n/2*(a+l)
→sum of multiples = 127/2* (85 +715)
→sum of multiples = 127/2 *800
→sum of multiples= 127*400
→sum of multiples= 50800
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HOPE IT HELPS..
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Answer 2

here is your answer