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A bag contains yellow, green, blue, and white marbles.  The ratio of yellow, green, blue, and white marbles is 1:2:3:4.  If the bag contains 180 marbles, then how many blue marbles are there?

 Jun 2, 2023
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\(( {\color{goldenrod}1}+{ \color{green}2}+{ \color{blue}3}+{ \color{Gray}4})n=180\\ 10n=180\\ n=18\\ There\ are\ {\color{blue}18\cdot 3=54}\ blue\ balls\ in\ the\ bag.\)

laugh  !

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 Jun 2, 2023

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