Question

Find the sum of the numbers lying between 200 and 700 which are multiples of 5.

• A. 44550
• B. 34440
• C. 65240
• D. 32300

Answer 1

Answer:

A. 44550

The numbers which are multiple of 5 between 200 and 700 starts with 205 and ends with 695 205 , 210 , 215............,695 an=a+(n−1)d Common difference, d=5 an=695(nthterm) a=205(first term) a+(n−1)d=995 205+(n−1)5=695 (n−1)5 = 695 - 205 = 490 n-1 = 490/5 = 98 n = 99 Sum = n/2 [ First term + Last term ] = 99/2 [ 205 + 695 ] = 99 × 900/2 = 44550