Question
In one Chinese class of 85 pupils, 0.25 of the boys and 45 of the girls passed the mock test. A total of 57 pupils passed the mock test. How many boys failed the Chinese mock test?
4 m

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In one Chinese class of 85 pupils, 0.25 of the boys and 45 of the girls passed the mock test. A total of 57 pupils passed the mock test. How many boys failed the Chinese mock test?