问答题

If a + 2b = 14 and 5a + 4b = 16, what is the average (arithmetic mean) of a and b

【参考答案】

2.5

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问答题

In writing all of the integers from 1 to 300, how many times is the digit 1 used

单项选择题

At Leo's Lumberyard, an 8-foot long wooden pole costs $3.00. At this rate, what is the cost, in cents, of a pole that is 16 inches long（）

A. 0.5
B. 48
C. 50
D. 64
E. 96

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