John′s age is 3x years 3 years after he was 27 years old what was his age 3 years before hence find the sum of the family ages Σ


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Question Number 39640 by Rio Mike last updated on 09/Jul/18

${J o h n}^{'} s a g e i s 3 x y e a r s 3 y e a r s$ $a f t e r h e w a s 27 y e a r s o l d$ $w h a t w a s h i s a g e 3 y e a r s b e f o r e$ $h e n c e f i n d t h e s u m o f t h e$ $f a m i l y a g e s \underset{x = 1}{\sum^{60}} {(3 x)}^{3 x - 1}$
	Answered by $@ty@m last updated on 09/Jul/18

	$3 x + 3 = 27$ $\Rightarrow x = 8$ $∴ {J o h n}^{'} s a g e 3 y r s b e f o r e = 21 y r s .$
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