mary and susan have 100 postcard in total.on susan's birthda

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mary and susan have 100 postcard in total.on susan's birthday,mary gives four over five of her postcard to susan.if susan has 85 postcards now.find the original number of postcards that mary has

【参考答案】

susan现在有卡85张,则mary现在有卡100-85=15张.
设mary原有卡m张,susan原有卡100-m张
(100-m)+[(4/5)m]=85
100-m+(4/5)m=85
100-(1/5)m=85
(1/5)m=15
m=75
于是,mary原来的卡片是75张.

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