Question

find the average of first 20 multiples of 7

Answer 1

hope this helps.........

Answer 2

hey mate
here is the answer
________

for the average of first 20 multiples of 7
we will find
sum of first 20 multiples of 7
first term (a) = 7 and
common difference (d) = 7
no. of terms (n) = 20
by formula
$\: sum \: of = \frac{n}{2} (2a + (n - 1)d) \\ n \: terms \: \:$

$= > \frac{20}{2} (2(7) + (20 - 1)7)$
$= > 10(14 + 133)$
$= > 10(147)$
$= > 1470$
now,
$1470 \div 20 \: \: is \: \: a \: \: average$
= 73.5

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