Multiple Choice Questions

Find the sum of first 20 multiples of 5 ........

Quantitative Aptitude (CSC) Average

Find the sum of first 20 multiples of 5.

1150

1250

1050

1350

Solution:
First find the average and then multiply it by 20.
5, 10, 15, 20…………100
Average = (5+100)/2 = 105/2
Sum = 105/2 * 20 = 1050

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