If 4a = 5b and ab ≠0, what is the ratio of a/5 to b/4? Choose the correct choice from the following answers
A) 125 / 64  B) 25 / 16  C) 1  D) 4 / 5  E) 64 / 125

Rationale: a nice fast approach is the first find a pair of numbers that satisfy the given equation : 4 a = 5 b here ' s one pair : a = 5 and b = 4 what is the ratio of a / 5 to b / 4 ? in other words , what is the value of ( a / 5 ) / ( b / 4 ) ? plug in values to get : ( a / 5 ) / ( b / 4 ) = ( 5 / 5 ) / ( 4 / 4 ) = 1 / 1 = 1 c
Answer: C