In a box there is a number of balls, out of which 1/5 are green, 1/2 are red, 1/10 are pink and the remaining 10 are orange. How many balls are green?	Choose the correct choice from the following choices:
A) 10 balls.
B) 40 balls.
C) 12 balls.
D) 50 balls.
E) 15 balls.
Let x be the total number of balls.   The number of green, red and pink balls is x(1/5+1/2+1/10)=8x/10   The number of orange balls is x-8x/10=2x/10.   Thus, 2x/10=10, from where x=100/2, x=50.   The number of green balls is   1/5*50= 
<gadget id="calculator">  1/5*50</gadget>
<output>10</output>
10.   10 balls.nswer 10 balls. 10.
<result>A</result>
In a box there is a number of balls, out of which 1/5 are green, 1/2 are red, 1/10 are pink and the remaining 10 are orange. How many balls are green?