Question

a box contains 785 balls whose colors are red white and blue. red and white together are 605 and white and blue number 471. How many of them are white?​

Answer 1

there are 134 white balls in the box

Answer 2

No of white balls = 291

$\sf\color{red}Working:$

red+white+blue = 785

red+white = 605

=> 605+blue = 785 => blue = 180

$\bold{\boxed{Now}}$

white+blue = 471

=> white = 471 - 180 = 291

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