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SAT官方每日一题附答案和解析[数学](2019年11月27日)

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答案:D

解析:

Choice D is correct.

Let T represent Hailey's total number of shirts. If 21% of Hailey's total number of shirts is 7, then the following equation can be written: 0.21T=7

To solve for T, multiply both sides of the equation by 0.21.

The value of T is 33.3. Because 21% represented an approximate portion of the total number of socks, the value found for T is not an exact amount. Therefore, the best answer for the Hailey's total number of shirts is 33.

The total number of shirts is 33.

重点单词   查看全部解释    
approximately [ə'prɔksimitli]

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adv. 近似地,大约

 
equation [i'kweiʃən]

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n. 相等,方程(式), 等式,均衡

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multiply ['mʌltiplai]

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vt. 乘,增加
vi. 扩大,繁衍,做乘法<

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solve [sɔlv]

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v. 解决,解答

 
multiple ['mʌltipl]

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adj. 许多,多种多样的
n. 倍数,并联

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portion ['pɔ:ʃən]

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n. 部分,份,命运,分担的责任

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laundry ['lɔ:ndri]

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n. 洗衣店,要洗的衣服,洗衣

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