Math, asked by ANYABELA, 5 months ago

9. Find the average of first 20 multiples of 7.
(1) 73.5
(2) 73
(3) 74.5
(4) 74

Answers

Answered by jakbattu

0

Answer:

(1) -------- 73.5

Step-by-step explanation:

7+14+21+.......140

a = 7 , d = 7 , n = 20 , l = 140

Sn = n/2 [ a+l ] = 20/2 (7+140)

Sn = 10 x 147 = 1470

=> average of first 20 multiples of 7 = 1470/20

= 147/2 = 73.5

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