题目内容

Bob and Jack share an apartment. If each month Bob pays a dollars and Jack pays b dollars,

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If the average (arithmetic mean) of 10, 20, 30, 40, and x is 60, what is the value of x？

A. 50
B. 60
C. 100
D. 150
E. 200

【B18】

A. holds
B. contains
C. obtains
D. remains

If 3a=b and 3c=d,then bd=

A. 3ac
B. 3a+c
C. 6a+c
D. 9ac
E. 9a+c

【B19】

A. common
B. low
C. prevalent
D. rare