Can you explain why as well? There's a picture.

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Answer 1 · 2018-07-21T06:52:09

$196$ .

Let $t_m$ denote the score in the $m^(th)$ test.

Then, by given, $86=(t_1+t_2+t_3+t_4)/4.$

$:. t_1+t_2+t_3+t_4=4xx86=344...............(star_1)$ .

We are required to find $t_5+t_6$ , such that,

$(t_1+t_2+t_3+t_4+t_5+t_6)/6=90,$

$or, t_1+t_2+t_3+t_4+t_5+t_6=6xx90=540...(star_2)$ .

Utilisig $(star_1)" into "(star_2)$ , we have,

$t_5+t_6=540-344=196$ .