exam Maths Puzzle Numerical Ability

How do you solve the equation m - 2n = 9 if the domain is { -1, 0, 5}?

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exam Other Question

A candy shop mixes nuts worth $1.10 per pound with another variety worth $0.80 per pound in order to make 42 pounds of a mixture worth $0.90 per pound. How many pounds of each kind of nut should be used? THE COORDINATES FOR A RECTANGLE ARE (3,11), (3,6), (9,6), AND (9,11).WHAT IS THE PERIMETER?