Question

step by step clearly
please tell me
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Answer 1

girls = 3/5

so boys = 2/5

so if 2/9 of girls were absent, this means 2/9 * 3/5 = 2/15 were absent

so if 1/4 of boys were absent, this means 1/4 * 2/5 = 1/10

so the total part absent = 1/10 + 2/15 = 3/30 + 4/30 = 7/30