In a jar there are balls in different colors: blue, red, green and yellow.
The probability of drawing a blue ball is 1/4.
The probability of drawing a red ball is 1/5.
The probability of drawing a green ball is 1/10.
If a jar cannot contain more than 50 balls, how many yellow balls are in the Jar?  Choose the correct choice from the following options:
A) 5.  B) 7.  C) 9.  D) 10.  E) 17.
We need to get some number which is less than 50 and exactly divisible by 4,5 and 10   Lets take LCM of three balls 4,5 and 10 =20.   The probability of drawing a blue ball is 1/4...For every 8 balls we get 1 BLUE ball then out of 20 balls we get 5 BLUE balls.   The probability of drawing a red ball is 1/5...For every 5 balls we get 1 RED ball then out of 20 balls we get 4 REB balls.   The probability of drawing a green ball is 1/10. For every 10 balls we get 1 GREEN ball then out of 20 balls we get 2 GREEN BALLS.   Then out of 20 - ( 5 + 4 + 2 )= 
<gadget id="calculator">20 - ( 5 + 4 + 2 )</gadget>
<output>9</output>
9 YELLOW balls.   IMO option 9. is correct.
<result>C</result>
In a jar there are balls in different colors: blue, red, green and yellow.
The probability of drawing a blue ball is 1/4.
The probability of drawing a red ball is 1/5.
The probability of drawing a green ball is 1/10.
If a jar cannot contain more than 50 balls, how many yellow balls are in the Jar?