Grade 6, percentage

There were a total of 840 guests at a wedding dinner.60% of them were adults while the rest were children.some boys left before the dessert was served.as a result,the percentage of adults increases to 70%.how many boys had left before the dessert was served?

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  1. 70% of (840 minus boys)
    ... equals
    ... 60% of 840

    588 - .7b = 504

    84 = .7b

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