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When one-fifth of the boys left, there were still b boys and g girls who stayed to see a program. What was the total number of boys and girls at the beginning of the program?
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After the boys left, there was b + g people who stayed and b=0.8B (b is after they left, B is before). There was 1/0.8 boys before they left, so the total is: 1.25B+g
Thank you Tom982
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