Leon used 2.1 liters of green paint to paint 42% of his room. He painted the remaining part of his room using brown paint. How many liters of brown paint did he use?

100% - 42%=58% 2.1 - 42% x - 58% so: 2.1/42 * 58=2.9 He used 2.9L of brown paint

What did you do after 2.1 - 42%?

x - liters of brown paint,

100% - the whole room,

of green paint to paint 42% of his room, so of brown paint 100%-42%=58%.

make up a proportion:

2.1/42%=x/58%,

so x=(2.1/42%)*58%=2.9L

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