exam Maths Puzzle Numerical Ability

Find the mean.

-9,-7,3,5,6,20

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exam Other Question

1. F(x)=3X+1

2. F(x)=-1/3X-2

3. Slope (-3,5), M=-1

4. Slope (3,0), m=4/3 the length of a rectangular field is 75yd.This is 3yd more than twice the width.how wide is the field??