book Maths Puzzle Numerical Ability

. Carlos and Mike agree race.Each leaves his own house at the same time and ride to the other�s house. A map of the race is shown. Carlos stays on the highway and averages 21 mp

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If I hvae these numbers 10,11,12,13,14,15,16,17,and 18.I have to put them in a tic-tac-toe order. So that every way like up, down,across,and diagonal.They would have the same numbe Given g(x)= 1/2x + 5, find g to the -1(x).