exam Maths Puzzle Numerical Ability

Given: Trapezoid ABCD with segment EF drawn horizontaly across the trapezoid, with E on segment AD and F and segment BC.
Segment AB is parallel to segment EF is parallel to

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Solve this equation:

(7/(k-3)) - (1/2) = (3/(k-4))

First, I got the same denominator on the left side of the equation:

2k-6, so my equation now looks like:

(-k + 17)/(2 A man spends $1.60 for thirty stamps, getting some 5 cent stamps and some 4 cent stamps. How much of each kind does he buy?