first-question-solve-for-x-k-1-5-kx-60-

Question Number 57549 by Joseph2002 last updated on 07/Apr/19

f i r s t q u e s t i o n .

s o l v e f o r x : \underset{k = 1}{\sum^{5}} k x = 60

Commented by math1967 last updated on 07/Apr/19

x + 2 x + 3 x + 4 x + 5 x = 60

\Rightarrow 15 x = 60 ∴ x = 4