book Maths Puzzle Numerical Ability

Use the midpoint formula to find the midpoint of the segment with the following endpoints:
a.(4,.5) and (3,-10)
b.(5,6) and (4,8)
c.(100,100) and (200,200)

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book Other Question

-2[4g-3]+9g=11g-18 Members of the Computer Club were assessed equal amounts to raise $1200 to buy some software. When 8 new members joined, the per-member assessmetn was reduced by $7.50. What was th