The sum of the first 25 numbers is 25*26/2 = 325
So the sum of the first 25 multiples of 12 is 325*12 = 3900
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Sum of first 25 multiples of 44+8+12....100taking 4 common4(1+2+3+4....+25) = 4*325 =1300
5 + 10 + 15 + 20 + 25 + 30 + 35 = 140 ANSWER = 140
20 + 25 + 30 = 75
12, 24, and 36
The first 6 multiples of 5 are: 5, 10, 15, 20, 25, and 30.