exam Maths Puzzle Numerical Ability

applications involving mixtures

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if someone wanted an average grade of 90 and they base the grade on 4 tests and the first 3 scores were 84 93 and 88 what would the last test score grade have to be to get a total average of 90?
85
88
92
or
95 Slope:-3/4 ; y-intercept: (0, 8)