book Maths Puzzle Numerical Ability

Find the inverse of teh relation f={(-5,1),(1,-5),(0,2)}

Read Solution (Total 0)

book Other Question

5 is what percent of 20?
12 is what percent of 24?
what percent of 35 is 7?
20 out of 60 is what percent?
Could you please help me solve the following Question:
{{{log(2,x)+log(3,(x+1))=4}}}
I have tried many ways of solving this including changing bases, but they always seem to end