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The experimental probability of randomly choosing a red ball from a bag filled with red and blue is #75%.# if there are 4 blue balls in the bag, how many red balls are there?

Answer 1

Number of Red balls #=12#

Given -

Probability of taking one red ball is #=75%=0.75# Number of Blue balls #=4# Number of Red balls #=?# Probability of taking one red ball is#=#Number of Red Balls#\/#(Number of Red balls + Number of Blue balls)

Let Number of Red Balls #=x#

#0.75=x/(x+4)# #x/(x+4)=0.75# #x=0.75(x+4)=0.75x+3# #x-0.75x=3# #0.25x=3# #x=3/0.25=12# Number of Red balls #=12#

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.