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#.