Question

FIND THE AVERAGE OF FIRST 20 MULTIPLES OF 12?

Answer 1

12+24+36+48+........+240. 2520

_________________________ = _______

20. 20

= 126

Answer 2

Answer:

Average of first 20 multiple of 12 is 126.

Step-by-step explanation:

To find: Average of first first 20 multiples of 12

first multiple of 12 = 12

20th multiple of 12 = 12 × 20 = 240

sum of first 20 multiple of 12  using sum of n term of AP,

we get

Sum = $\frac{20}{2}(2\times12+(20-1)12)$

       = $10(24+(19)12)$

       = $10(24+228)$

       = $10(252)$

       = $2520$

Average = $\frac{Sum}{20}$

              = $\frac{2520}{20}$

              = $126$

Therefore, Average of first 20 multiple of 12 is 126.