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Read the following SAT test question and then click on a button to select your answer.
A machine can insert letters in envelopes at the rate of 120 per minute. Another machine can stamp the envelopes at the rate of 3 per second. How many such stamping machines are needed to keep up with 18 inserting machines of this kind?
(A)12
(B)16
(C)20
(D)22
(E)24
| 重點(diǎn)單詞 | 查看全部解釋 | |||
| stamp | [stæmp] |
想一想再看 n. 郵票，圖章，印，跺腳 |
||
| multiple | ['mʌltipl] |
想一想再看 adj. 許多，多種多樣的 |
聯(lián)想記憶 | |
| equation | [i'kweiʃən] |
想一想再看 n. 相等，方程(式), 等式，均衡 |
聯(lián)想記憶 |
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