Question
What is the average of the first 20 multiples of
12?Solution
ATQ, Multiples of 12 = 12, 24, 36, 48, ... Sum of the first 20 multiples of 12: 12+24+36+…=12×(1+2+3+…+20) Using the formula for the sum of the first 20 natural numbers: 
Thus, the average is 126 .
More Algebra Questions
728, 737, ?, 778, 814, 863
What will come in place of the question mark (?) in the following series?
102, 111, 136, 185, 266, ?
What will come in place of the question mark (?) in the following series?
10, 135, ?, 226, 234, 235
7, 176, ?, 378, 427, 452
...18, 10, 12, 21, ?, 120
126 56 ? 12 10 2
...- What will come in place of (?) in the given number series.
2, 6, 15, 31, 56, ? What will come in place of (?) question mark in the given number series.
5, 15, 35, 75, 155, ?
8 24 48 144 288 ?
...7 4 5 9 20 ? 160.5
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