book Maths Puzzle Numerical Ability

what is 3/5n-4=56 ?

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book Other Question

Ruth bicycles 5km/h slower than bill. In the time that it takes Ruth to bicycle 42km, bill can bicycle 57km. How fast does each bicyclist travel? solve -3/x+9/9x=-1 a)=-5/6 b)=-6/5 c)2 d) no answer

solve by addition
4x-y=3 5x+4y=2
a)(1,__) b), c)-10/21 d)23/21 (__,2)