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Problem 31

Wanda, Darren, Bratrice, and Chi are tutors in the school math club. Their schedule is as follows: Darren works every third school day, Wanda works every fourth school day, Beatrice works every sixth school day, and Chi works every seventh school day. Today they are all working in the math club. In how many school days from today will they next be together tutoring in the lab ?

(A) 42 (B) 84 (C) 126 (D) 178 (E) 252

ANSWER: B

Problem 30

When the decimal point of a certain positive decimal number is moved four places to the right, the new number is four times the reciprocal of the original number. What is the original number ?

(A) 0.0002 (B) 0.002 (C) 0.02 (D) 0.2 (E) 2

ANSWER: C

Problem 29

Let P(n) and S(n) denote the product and the sum, respectively, of the digits of the integer n. for example, P(23)=6 and S(23)=5. Suppose N is a two-digit number such that N=P(N)+S(N). What is the unit digit of N ?

(A) 2 (B) 3 (C) 6 (D) 8 (E) 9

ANSWER:E

Problem 26

In year N, the 300th day of the year is a Tuesday. In year N+1, the 200th day is also a Tuesday. On what day of the week did the 100th day of year N-1 occur ?

(A) Thursday (B) Friday

(C) Saturday (D) Sunday

(E) Monday

ANSWER: A

Problem 25

One morning each member of Angela’s family drank an 8-ounce mixture of coffee with milk. The amounts of coffee and milk varied from cup to cup, but were never zero. Angela drank a quarter of the total amount of milk and a sixth of the total amount of coffee. How many people are in the family?

(A) 3 (B) 4 (C) 5 (D) 6 (E) 7

Problem 24

When the mean, median, and mode of the list

10,2,5,2,4,2,x

are arranged in increasing order, they form a non-constant arithmetic progression. What is the sum of all possible real values of x?

(A) 3 (B) 6 (C) 9 (D) 17 (E) 20

ANSWER: E