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Maths Puzzle
Numerical Ability
please help me with this equation. If the lines represented by the equations 2y=3x+4 and y-ax-5=0 are parallel, What is the value of a?
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A man row a boat 24 km upstream in 3 hours and returns downstream in 1.5 hour.
(a) Find the speed of the stream
(b) Find the speed of the boat in still water
Mr. Turner invested a sum of money at 7% and twice that sum at 3%. His yearly return was $390. How much did Mr. Turner invest at each rate?
(This problem is not from a textbook). Please help, Thank You