单项选择题

From an estate，x dollars was distributed such that each of two children receiveddollars and the widow received the remaining$90，000．（）

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D.if the relationship cannot be determined from the information given.

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单项选择题

The number of connections C that can be made through a switchboard to which T-telephones are connected is given by the formula How many more connections are possible with 30 telephones than with 20 telephones（）

A. 435
B. 245
C. 190
D. 45
E. 10

单项选择题

For all real numbers u，the operation u* is defined by the equation*=v．If (v*)=8，then v=（）

A. 15
B. 18
C. 21
D. 24
E. 27