exam Maths Puzzle Numerical Ability

The mean of 21 test score is 78. What mean score must three additional students acheive so that the mean for all 24 students is 80.

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exam Other Question
Find an equation of the line.
35) A horizontal line passing through (5/6), 0 For the function defined by f(x)=2-x^2, 0<x, find a formula for f ^-1(x).