The average rainfall over a given place during the three years period of $2017 - 2019$ was $65$ cm. During the three year period $2016 -2018$ the average rainfall was $63$ cm .The actual rainfall during $2019$ was $60$cm .what was the rainfall in $2016 $?

choose the correct option

$a)$ $55$cm

$b)$ $60$ cm

$c) $$54$ cm

$d)$ $53$ cm

Im confused



(1) You can figure out the two three-year totals.

(2) Any difference would have to be due to 2016 vs. 2019, since the other years are common to both three-year periods.

(3) As an aside...How do we know the 2019 total??

  • $\begingroup$ what is the answer ? $\endgroup$ – Messi fifa Jun 15 at 14:34
  • 2
    $\begingroup$ If someone just tells you the answer, you really don't learn anything. Try to work it our from the hints I gave. $\endgroup$ – paw88789 Jun 15 at 14:41
  • $\begingroup$ ,,,@paw88789 im not getting ur hints....pliz write complete answer $\endgroup$ – Messi fifa Jun 15 at 14:49

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