exam Maths Puzzle Numerical Ability

if k = 0, then the solution set of : 20-x < k is,

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exam Other Question

The first of the three numbers exceeds the third by one-half of the second. The sum of the second and te third numbers is one more than the first. If the second is subtracted from given that logbase4^(y-1)+logbase4^x/2=a and logbase2^(y+1)-logbase2^x=a-1.
show that y^2=1+8^a and find the possible value of x and y when a=1
(text book:basic mathematics for s