In a jar there are balls in different colors: blue, red, green and yellow.
The probability of drawing a blue ball is 1/8.
The probability of drawing a red ball is 2/5.
The probability of drawing a green ball is 7/10.
If a jar cannot contain more than 50 balls, how many yellow balls are in the Jar?  Pick:
A) 12	B) 15	C) 23	D) 7	E) 5
answer of 1st   just add the given probabilities p(blue)+p(red)+p(green) i.e   1/8+2/5+ 3/10=5+16+12/40   now we know p(blue)+p(red)+p(green)+p(yellow)=1   33/40+p(yellow)=1   p(yellow)=33/40   i.e why yellow balls are 7.   7
<result>D</result>
In a jar there are balls in different colors: blue, red, green and yellow.
The probability of drawing a blue ball is 1/8.
The probability of drawing a red ball is 2/5.
The probability of drawing a green ball is 7/10.
If a jar cannot contain more than 50 balls, how many yellow balls are in the Jar?